Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
su cac » su cao, su can, eu cac
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 cac) OR (tu cac)) ky nang xa hoi. hieu vien ((cac tuc) or (cac tac)) va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (tu cac)) ky nang xa hoi. hieu vien ((cac tuc) OR (cac tac)) va hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cac) OR (tu cac)) ky nang xa hoi. hieu vien ((cac tuc) or (cac tac)) va hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((su cac) OR (tu cac)) ky nang xa hoi. hieu vien ((cac tuc) or (cac tac)) va hanh vi va triet*.