Perhaps you should try some spelling variations:
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
cu tren » tu tren
cam tuc » cam xuc, cam tu, nam thuc
cham ky » pham ky, cam ky
tu cham » toc cham, thi cham
dai hoi » dai hoc, dai hai, dai moi
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cham ky nang ((ma hoi) OR (dai hoi)). hieu van cam tuc va thanh ve ((cu tren) OR (dua tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cham ky nang ((ma hoi) or (dai hoi)). hieu van cam tuc va thanh ve ((cu tren) OR (dua tren))~".
• Adding a wildcard symbol may retrieve word variants: tu cham ky nang ((ma hoi) or (dai hoi)). hieu van cam tuc va thanh ve ((cu tren) OR (dua tren))*.