Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu sang » chieu sang, hieu lang, hieu quang
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban
toan tap » toan ban

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 sang - thanh tung cua nhung ((cong dan) or (cong san)) ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh tung cua nhung ((cong dan) OR (cong san)) ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh tung cua nhung ((cong dan) or (cong san)) ((toan cao) or (toan tap))*.