Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang xa hoi. ((hieu viec) or (hieu ve)) cac tac van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang xa hoi. ((hieu viec) OR (hieu ve)) cac tac van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. ((hieu viec) or (hieu ve)) cac tac van hanh vi va triet*.