Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doi hieu » doi chieu, doc hieu, doi hien
dong cua » dung cua, cong cua, huong cua
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap
ha dong » hoat dong, van dong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - ha dong cua ((nhung cong) or (dung cong)) dan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ha dong cua ((nhung cong) OR (dung cong)) dan ((than cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ha dong cua ((nhung cong) or (dung cong)) dan ((than cao) or (toan cao))*.