Perhaps you should try some spelling variations:
truong quan » trong quan, luong quan, truong van
chieu sang » chieu sach, chieu xanh, hieu lang
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - thanh ((truong quan) or (thong quan)) dung cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh ((truong quan) OR (thong quan)) dung cong tac than cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh ((truong quan) or (thong quan)) dung cong tac than cau*.