Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh nhan, doanh luan
doanh van » doan van, doanh va, doanh nhan
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
luc va » duc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu ve cham ((luc va) or (tuc va)) ((doanh van) OR (doanh ban)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve cham ((luc va) OR (tuc va)) ((doanh van) OR (doanh ban)) cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ve cham ((luc va) or (tuc va)) ((doanh van) OR (doanh ban)) cau tren*".