Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh nhan, doanh luan
doanh van » doan van, doanh va, doanh nhan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va cau » van cau, va cac, va dau
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ky nang x ho. lieu va cau ((luc va) or (tuc va)) ((doanh van) OR (doanh ban)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. lieu va cau ((luc va) OR (tuc va)) ((doanh van) OR (doanh ban)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x ho. lieu va cau ((luc va) or (tuc va)) ((doanh van) OR (doanh ban)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. lieu va cau ((luc va) or (tuc va)) ((doanh van) OR (doanh ban)) cua te*.