Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
luan cong » luat cong, luong cong, luan chung
trinh tan » trinh toan, trinh tuan, trinh han
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) or (hieu manh)) - tinh quang luan cong trinh tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (hieu manh)) - tinh quang luan cong trinh tan van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (hieu manh)) - tinh quang luan cong trinh tan van ban*.