Perhaps you should try some spelling variations:
hoc trieu » hoc thieu, hoc tieu, hoc dieu
anh tang » anh bang, anh dang, anh nang
cong dan » huong dan, cong dong, cong tac
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan tap » toan ban
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: hoc trieu tinh - anh tang va thuong ((((cong dan) OR (cong tan))) or (cong san)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc trieu tinh - anh tang va thuong ((((cong dan) OR (cong tan))) OR (cong san)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc trieu tinh - anh tang va thuong ((((cong dan) OR (cong tan))) or (cong san)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc trieu tinh - anh tang va thuong ((((cong dan) OR (cong tan))) or (cong san)) toan tap*.