Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
van hanh » van thanh, ban hanh, van anh
hanh via » hanh vi, hanh va, anh va
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang ma » tang ma, sang ma, nang cao
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
anh v » anh va, anh ve, canh v

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc anh v nang ma hoi. ((hieu qua) or (hieu quan)) cam luc van hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc anh v nang ma hoi. ((hieu qua) OR (hieu quan)) cam luc van hanh via cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc anh v nang ma hoi. ((hieu qua) or (hieu quan)) cam luc van hanh via cua tre*.