Perhaps you should try some spelling variations:
tranh quang » tran quang, trinh quang, tinh quang
trinh thong » trinh thuong, trinh trong, trinh tong
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
thong luan » thong quan, tong luan, thong xuan
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) OR (chieu 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) OR (chieu sang)) - canh ((tranh quang) OR (trinh qua)) trinh thong luan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (chieu sang)) - canh ((tranh quang) or (trinh qua)) trinh thong luan van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (chieu sang)) - canh ((tranh quang) or (trinh qua)) trinh thong luan van ban*.