Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
dai tuc » dai thuc, dai truc, dao tuc
va hanh » van hanh, va thanh, va danh
su cac » tu cac, su can, eu cac
su cao » cu cao, vu cao, su co
tuc va » thuc va, truc va, tuc xa
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 (su cao)) ky nang xa hoi. hieu vien dai tuc va hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cac) OR (su cao)) ky nang xa hoi. hieu vien dai tuc va hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((su cac) OR (su cao)) ky nang xa hoi. hieu vien dai tuc va hanh vi va triet*.