Perhaps you should try some spelling variations:
thanh luong » thanh huong, thanh long, thanh cuong
chieu sang » chieu sach, chieu xanh, hieu lang
luong quan » thong quan, duong qua
quan dung » quang dung, quan duong, qua dung
trong van » trong cac
ho chieu » theo chieu, hoc thieu, doi chieu
khan cap » khoan cam, phan cac, phan cau
than cap » thanh lap, thanh cac, than cua
khan ap » han ap, khan dam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh luong quan dung trong van ((((khan cap) OR (than cap))) OR (khan ap))~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh luong quan dung trong van ((((khan cap) or (than cap))) or (khan ap))*.