Perhaps you should try some spelling variations:
doanh mang » doanh sang, doanh quang, doanh van
doanh ban » doanh bat, doanh van, doanh nhan
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hieu ve » hieu van
cuu va » cuu van, cuu ve
y nang » ky nang, ly nang, v nang
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu va) OR (hieu ve)) cap cuu va ((doanh mang) OR (doanh ban)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. ((hieu va) or (hieu ve)) cap cuu va ((doanh mang) OR (doanh ban)) cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu va) or (hieu ve)) cap cuu va ((doanh mang) OR (doanh ban)) cua te*.