Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh van » doan van, doanh va, doanh ban
cau treo » cau theo, cau tren, cau triet
dau treo » dau tren, dau theo, dau tien
pham duy » pham duc
thu nang » thi nang, thu hang, thu bang
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duy van » duy vat, dung van
vu sach » vu bach, su sach, vu khach

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

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