Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
nhan quang » nhanh quang, phan quang, nhat quang
quang dung » quang trung, ung dung, cuong dung
hanh nhan » thanh nhan, danh nhan, anh nhan
thanh ban » thanh san, thanh van, thanh bac
cong van » cong vang, song van, cong tan
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (chiet tach)) - hanh nhan quang dung ((cong van) or (cong san)) thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - hanh nhan quang dung ((cong van) OR (cong san)) thanh ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chiet tach)) - hanh nhan quang dung ((cong van) or (cong san)) thanh ban*.