Perhaps you should try some spelling variations:
thanh tung » thanh cong
cho chuong » theo chuong, cho cong, cho truong
cao truong » cac truong, cho truong, cau truong
thong tran » thong than, thong tren, phuong tran
hieu sang » chieu sang, hieu lang, hieu quang
doc hieu » toc thieu, hoc thieu, hoc hien
tran 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 hieu sang - thanh tung ((cho chuong) or (cao truong)) thong tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh tung ((cho chuong) OR (cao truong)) thong tran van ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh tung ((cho chuong) or (cao truong)) thong tran van ban*.