Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hau treo » cau treo, cau theo, dau tren
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
ban hau » van hau, ban dau, ban ham
duy va » duy van, day va, duy v

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 thu nang xa hoi. ((hieu va) OR (lieu va)) pham ((duy va) or (duy vat)) doanh ban hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. ((hieu va) OR (lieu va)) pham ((duy va) OR (duy vat)) doanh ban hau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang xa hoi. ((hieu va) OR (lieu va)) pham ((duy va) or (duy vat)) doanh ban hau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. ((hieu va) OR (lieu va)) pham ((duy va) or (duy vat)) doanh ban hau treo*.