Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
ky lang » ky nang, tay lang
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
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 lang) OR (ky tang))) or (ky dang)) xa hoi. hieu viec cac tac van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ky lang) OR (ky tang))) OR (ky dang)) xa hoi. hieu viec cac tac van hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu viec cac tac van hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu viec cac tac van hanh vi va triet*.