Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hieu sach » chieu sach, hieu cach, dien sach
tranh cua » manh cua
doanh cua » doanh luan
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - canh ((tranh cua) OR (doanh cua)) hang ((cong tan) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - canh ((tranh cua) OR (doanh cua)) hang ((cong tan) OR (cong thanh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - canh ((tranh cua) OR (doanh cua)) hang ((cong tan) or (cong thanh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - canh ((tranh cua) OR (doanh cua)) hang ((cong tan) or (cong thanh)) toan cao*.