Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
vien da » vien dai, hien dai
toc van » hoc van, toc san, oc van
tac van » tac vang, cac van, tac va
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 khach ky nang xa hoi. hieu vien da ((toc van) or (tac van)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang xa hoi. hieu vien da ((toc van) OR (tac van)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang xa hoi. hieu vien da ((toc van) or (tac van)) hanh vi ve triet*.