Perhaps you should try some spelling variations:
dien viet » tieng viet, trien viet, gian viet
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
vu sach » su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
toc van » hoc van, toc san, tac van
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: ((vu sach) or (vu bach)) ky nang xa hoi. ((hieu ve) or (dien viet)) cac toc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) ky nang xa hoi. ((hieu ve) OR (dien viet)) cac toc van hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu bach)) ky nang xa hoi. ((hieu ve) or (dien viet)) cac toc van hanh vi ve triet*.