Perhaps you should try some spelling variations:
dien viet » tieng viet, trien viet, gian viet
van thanh » ban thanh, van tuan
hieu viec » nhieu viec, hieu ve, sieu viet
ve triet » va trien, su triet
van hanh » ban hanh, van anh, van ban
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
vu sac » vu sach, vu san, va sac
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 sac ky nang xa hoi. ((hieu viec) or (dien viet)) cac toc ((van hanh) OR (van thanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang xa hoi. ((hieu viec) OR (dien viet)) cac toc ((van hanh) OR (van thanh)) vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang xa hoi. ((hieu viec) or (dien viet)) cac toc ((van hanh) OR (van thanh)) vi ve triet".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang xa hoi. ((hieu viec) or (dien viet)) cac toc ((van hanh) OR (van thanh)) vi ve triet*.