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2 males in alcohol, October 30, 2015, Vietnam, Lao Cai Prov., Sa Pa Distr., Ban Khoang env., 22.3872N, 103.7867E, 1682m a.s.l.
Wing length ca. 4.8mm. Antennae 14-segmented, long (ca. 2mm or 0.4 length of wing), first flagellomere the longest segment. Three ocelli present. Only hind tibiae with a spur-like setose appendage, longer than tibia width, or ca. two-thirds of tarsomere 5. Coxae not elongated, trochanters ventrally with black streaks, the longest ones on hind trochanters. General colouration brownish yellow, thoracic dorsum darker.
I moved from Nepaletricha to Hesperinidae to Mycetobiidae, all rejected because of the present combination of characters.
Wings badly deformed in alcohol so here's my sketch, the venation is rather peculiar, I couldn't make out any of subcostal vein (too weak, too short?). Dotted lines show where veins (in my view at least) seemed evanescent, almost like folds.

[Subject changed from Nematocera, Vietnam - which family?? to Blephariceridae, Philorus, Vietnam. ID credits: Paul Beuk]

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The head to show structure of palpi.

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The spur on hind tibia.

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Hind leg, tarsal claws.

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Male genitalia, dorsal, lateral (not so good, just to get the general idea), and ventral views.

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General head shape reminds me of Ceratopogonidae but then the antennae are off. I asked Peter Chandler for his opinion.

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Thanks Paul, yet I believe Ceratopogonidae got no ocelli...

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And that is in addition to the wrong antennae. ;)

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Could you check against Blephariceridae (Philorus)?

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Well Paul I think you're quite right, elongated mouthparts, antennae of 13 to 15 segments, Sc rudimentary, hind tibiae with 1 or 2 spurs, male genitalia of similar structure. I omitted Blephariceridae because in Stackelberg it is considered that vein C is developed in whole wing, while Courtney writes that C reaches only the apex of R5.

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I think the closest match is Philorus assamensis (Tonnoir, 1930) [Notes on Indian blepharocerid larvae and pupae with remarks on the morphology of blepharocerid larvae and pupae in general. Records Indian Mus. 32(2), pp. 207-209], as Euliponeura, synonimysed by Zwick in 1990. Couldn't find any proper records of Blephariceridae from Vietnam...

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Yes, I agree with Blephariceridae

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Without species, two genera are mentioned in this paper: https://www.acade...etnam_2008.

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By the way, Zwick & Arefina (2005) establish there is a clearly monophyletic group within Philorus for which the name Euliponeura is available but recognizing it as a valid genus would render the remainder of Philorus paraphyletic...