Perhaps you should try some spelling variations:
trong trang » trong tieng, trong tan, hong trang
chieu sang » chieu sach, chieu xanh, nhieu tang
trong tang » trong tan, trong dang, trong tieng
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cong tang » cong thang, cong tan, cong lang
tang luan » dung luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (hieu lang)) - manh ((trong trang) OR (trong tang)) nhung cong tang luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - manh ((trong trang) OR (trong tang)) nhung cong tang luan van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - manh ((trong trang) OR (trong tang)) nhung cong tang luan van".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - manh ((trong trang) OR (trong tang)) nhung cong tang luan van*.