Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hat nhan » ca nhan, tao nhan, van nhan
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
hai hau » hai chau, dai hau, hai hai
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ma hoi. ((hieu va) or (hieu van)) cam luc va hanh ((hai hau) or (hat nhan)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoi. ((hieu va) OR (hieu van)) cam luc va hanh ((hai hau) OR (hat nhan)) treo.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoi. ((hieu va) or (hieu van)) cam luc va hanh ((hai hau) or (hat nhan)) treo*.