Perhaps you should try some spelling variations:
cong thuong » hang thuong
chieu sang » chieu sach, chieu xanh, hieu lang
chieu tinh » trieu tinh, lieu tinh, chau tinh
tinh hoang » minh hoang, dinh hoang, binh hoang
thuong tan » thuong han, thuong lan, thuong tin
hoang van » hang va
van cong » van dong, van phong, phan cong
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 tinh)) - tinh hoang van cong thuong tan luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu tinh)) - tinh hoang van cong thuong tan luan van.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu tinh)) - tinh hoang van cong thuong tan luan van*.