Perhaps you should try some spelling variations:
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 cam ky nang ((ma hoi) OR (dai hoi)). hieu ve cam tuc va dan vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (dai hoi)). hieu ve cam tuc va dan vi cua tre*.