Perhaps you should try some spelling variations:
vu sang » vua sang, vu dang, vu san
sang ky » sang kyo, dang ky, tang ky
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
cu tren » tu tren, dua tren
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, 5 hoi

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 nang ((x hoi) OR (x ho)). hieu ve cam tuc va dinh vi ((cua tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sang ky nang ((x hoi) OR (x ho)). hieu ve cam tuc va dinh vi ((cua tre) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sang ky nang ((x hoi) OR (x ho)). hieu ve cam tuc va dinh vi ((cua tre) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: vu sang ky nang ((x hoi) OR (x ho)). hieu ve cam tuc va dinh vi ((cua tre) or (cu tren))*.