Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
mai hoi » mai khoi, dai hoi, lai hoi
cham ky » pham ky, cam ky
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
tu cham » toc cham, thi cham
ma hoi » xa hoi, ma hoa, me hoi
vi dau » vi dai, va dau, bi dau

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 (mai hoi))) OR (dai hoc)). hieu van cam truc va thanh vi dau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cham ky nang ((((ma hoi) or (mai hoi))) or (dai hoc)). hieu van cam truc va thanh vi dau tren*.