Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
lai va » loai va, mai va, dai va
thiet » thieu

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 sach tu nang xa hoi. ((hieu ve) OR (hieu qua)) cam luc va hanh lai va thiet~.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu ve) or (hieu qua)) cam luc va hanh lai va thiet*.