Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
van doanh » toan doanh, van dong, van thanh
dau treo » dau tren, cau treo, dau theo
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
pham duy » pham duc
van dau » van dao, phan dau
duy van » duy vat, dung van
su sach » so sach, vu sach
hieu ve » hieu va
ki nang » ky nang
x hoi » xa hoi, o hoi, x ho

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

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