Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
mang thong » mang trong, hang thuong, dang thuong
quang lua » quang cua, quang tuan, quang xuan
thong tan » thong than, thong tran, thong tin
lua mang » cua mang, lua sang, qua mang
tan luan » tang luan, toan luan, dan luan

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 (chieu sach)) - tinh quang lua mang thong tan luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu sach)) - tinh quang lua mang thong tan luan van.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu sach)) - tinh quang lua mang thong tan luan van*.