Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
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 lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac tac » cac toc, cac bac, cac dac
cac dai » cac dan, cac bai, can dai
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 lang xa hoi. hieu viec ((cac tac) or (cac dai)) van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu viec ((cac tac) OR (cac dai)) van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu viec ((cac tac) or (cac dai)) van hanh vi va triet*.