Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hanh de » hanh ve, hanh kem
luc van » luoc van, luu van, duc van
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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: te sac ky nang ma hoi. ((hieu ve) OR (hieu va)) cam luc van hanh de ((cua tre) OR (cua vat))~.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ma hoi. ((hieu ve) or (hieu va)) cam luc van hanh de ((cua tre) or (cua vat))*.