Perhaps you should try some spelling variations:
trinh thong » trinh thuong, trinh trong, trinh tong
tranh quang » tran quang, trinh quang, tinh quang
thieu sang » chieu sang, thieu khang, thieu quang
thong luan » thong quan, tong luan, thong xuan
hoc thieu » toc thieu, hoc hien
trinh qua » trinh quan, trinh cua, trinh quang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - canh ((tranh quang) or (trinh qua)) trinh thong luan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh ((tranh quang) OR (trinh qua)) trinh thong luan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ((tranh quang) or (trinh qua)) trinh thong luan van ban*.