Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
thang va » hang va, trang va, thong va
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: doi hieu lang - cang thang va nhung cong san ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - cang thang va nhung cong san ((toan cao) OR (toan tap))*.