Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hoc sach » hoc sinh, hoc cac, hoc anh
hanh via » hanh vi, hanh va, anh va
van hanh » van thanh, ban hanh, van anh
via cua » gia cua, gian cua, giau cua
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((v nang) OR (va nang)) xa 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 sach ((v nang) OR (va nang)) xa hoi. ((hieu qua) OR (hieu quan)) cam luc van hanh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((v nang) OR (va nang)) xa hoi. ((hieu qua) or (hieu quan)) cam luc van hanh via cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((v nang) OR (va nang)) xa hoi. ((hieu qua) or (hieu quan)) cam luc van hanh via cua tre*.