Perhaps you should try some spelling variations:
sieu viet » su viet, dien viet, bien viet
hieu viec » nhieu viec, hieu ve, hieu hien
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
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 ty nang xa hoi. ((hieu viec) or (sieu viet)) cac hoc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. ((hieu viec) OR (sieu viet)) cac hoc van hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. ((hieu viec) or (sieu viet)) cac hoc van hanh vi ve triet*.