Perhaps you should try some spelling variations:
dung cong » dung trong
hieu tach » hieu cach, chiet tach, chieu sach
doc hieu » toc thieu, hoc thieu, hoc hien
anh bang » anh hoang, anh quang, tinh bang
bang cua » ban cua, mang cua, hang cua
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
than cap » khan cap, thanh lap, thanh cac
khan dam » thanh dam, chang dam, khanh nam
han ap » han tap, khan ap, dan ap

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 tach - anh bang cua dung cong san ((than cap) or (((han ap) or (khan dam))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tach - anh bang cua dung cong san ((than cap) OR (((han ap) OR (khan dam)))).
• Adding a wildcard symbol may retrieve word variants: doc hieu tach - anh bang cua dung cong san ((than cap) or (((han ap) or (khan dam))))*.