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 dan » cong san, cong tan, huong dan
than cap » khan cap, thanh lap, thanh cac
khan ap » khan cap, han ap, khan dam

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