Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
vanh tai » van tai, hanh tai, anh tai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
xanh tai » hanh tai, anh tai, doanh tai
vu sang » vua sang, vu dang, vu san
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
sang ky » sang kyo, dang ky, tang ky
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sang ky tang mai hoi. hieu van cham ((xuc va) OR (tuc va)) ((xanh tai) or (vanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sang ky tang mai hoi. hieu van cham ((xuc va) OR (tuc va)) ((xanh tai) OR (vanh tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sang ky tang mai hoi. hieu van cham ((xuc va) OR (tuc va)) ((xanh tai) or (vanh tai)) cua tre*".