Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
su viet » so viet
cac hoc » cach hoc, cac hop, bac hoc
hoc van » hoc dan, hoc va, hoc vat
vi ve » va ve, gi ve, ve ve

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

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