Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hau treo » cau treo, cau theo, dau tren
thu sach » tu sach, thuat sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
va doanh » van doanh, vay doanh, va danh
hieu va » lieu va, hieu qua
van hau » van ha, van hai, van dau
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) thu nang xa hoi. ((hieu ve) OR (hieu va)) pham duc va doanh van hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) thu nang xa hoi. ((hieu ve) OR (hieu va)) pham duc va doanh van hau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) thu nang xa hoi. ((hieu ve) OR (hieu va)) pham duc va doanh van hau treo".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) thu nang xa hoi. ((hieu ve) OR (hieu va)) pham duc va doanh van hau treo*.