Perhaps you should try some spelling variations:
anh tang » anh bang, anh dang, anh nang
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cao » toan tap
toan ban » van ban
theo bo » thao bo, theo doi, theo don
bo sach » co sach, hoc sach
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo bo sach - anh tang va nhung ((cong tan) or (cong tac)) ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo bo sach - anh tang va nhung ((cong tan) OR (cong tac)) ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo bo sach - anh tang va nhung ((cong tan) or (cong tac)) ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo bo sach - anh tang va nhung ((cong tan) or (cong tac)) ((toan cao) OR (toan ban))*.