Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
doanh co » doanh cua, doanh va, anh co
cao hoi » cau hoi, co hoi, cao hoc
tuc va » thuc va, truc va, tuc xa
co cua » con cua, ca cua, cong cua
tu san » thu san, tu ban, tu can
xuc va » duc va, luc va, xac va
san ky » sang ky, van ky, dan ky
cua su » qua su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang cao hoi. ((hieu vien) OR (hieu viec)) chat ((xuc va) or (tuc va)) doanh co cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang cao hoi. ((hieu vien) OR (hieu viec)) chat ((xuc va) OR (tuc va)) doanh co cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang cao hoi. ((hieu vien) OR (hieu viec)) chat ((xuc va) or (tuc va)) doanh co cua su".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang cao hoi. ((hieu vien) OR (hieu viec)) chat ((xuc va) or (tuc va)) doanh co cua su*.