Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
cac dac » cac dan, cac dai, cac bac
cac tac » cac toc, cac bac, cac tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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) OR (hieu ve)) ((cac tac) or (cac dac)) 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) OR (hieu ve)) ((cac tac) OR (cac dac)) van hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu viec) OR (hieu ve)) ((cac tac) or (cac dac)) van hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu viec) OR (hieu ve)) ((cac tac) or (cac dac)) van hanh vi va triet*.