Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
va doanh » van doanh, vay doanh, va danh
ban quan » van quan
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu va » lieu va, hieu qua
cau loc » hau loc, cau hoc, cau luc
quan te » quan he, quan ve, quang tue
va cau » van cau, va cac, va dau
loc va » hoc va, luc 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) OR (te sach)) ky nang x ho. hieu va cau loc va doanh ban quan te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang x ho. hieu va cau loc va doanh ban quan te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang x ho. hieu va cau loc va doanh ban quan te*.