Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vu khach » vu khanh, vu khac, vay khach
san hanh » san thanh, ban hanh, van hanh
ve triet » va trien, su triet
vu sach » vu bach, su sach
nang xa » nang x, lang xa, nang ma
cac toc » cac toi, cac nuoc, cac thoi
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 sach) OR (vu khach)) ky nang xa hoi. hieu vien ((cac toc) or (cac hop)) san hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang xa hoi. hieu vien ((cac toc) OR (cac hop)) san hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang xa hoi. hieu vien ((cac toc) or (cac hop)) san hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang xa hoi. hieu vien ((cac toc) or (cac hop)) san hanh vi ve triet*.