Perhaps you should try some spelling variations:
hieu vien » hieu viec, thieu nien, hieu tieng
hieu hien » bieu hien, dieu hien, chieu chien
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
hop van » ho van, hoa van, hop va
hoc van » hoc dan, hoc va, hoc vat
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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: su sac ky nang xa hoi. ((hieu vien) or (hieu hien)) cac ((hop van) OR (hoc van)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((hieu vien) OR (hieu hien)) cac ((hop van) OR (hoc van)) hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((hieu vien) or (hieu hien)) cac ((hop van) OR (hoc van)) hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu vien) or (hieu hien)) cac ((hop van) OR (hoc van)) hanh vi ve triet*.