Perhaps you should try some spelling variations:
trang thong » tran thong, trang phong, thong thong
trong trang » trong tang, trong tieng, trong tan
manh trong » manh truong, anh trong, manh trung
chieu sang » chieu sach, chieu xanh, nhieu tang
thong cong » trong cong, tong cong, thong thong
hieu lang » hieu quang, nhieu tang, hieu van
cong tac » cong ty
tac luan » tac quan, tao luan, tang 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 thong cong tac luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - manh trong trang thong cong tac luan van.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - manh trong trang thong cong tac luan van*.