Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hieu sang » chieu sang, hieu lang, hieu quang
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
anh nang » ganh nang, anh bang, anh dang
nang cua » mang cua, hang cua, nang dua
cong tac » cong ty
toan cao » toan ban, toan tap

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