Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
thong manh » thong minh, thong mang, thong danh
trinh qua » trinh quan, trinh cua, trinh luat
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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)) - hanh ((trinh qua) or (trinh quang)) thong thong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - hanh ((trinh qua) OR (trinh quang)) thong thong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (chieu sang)) - hanh ((trinh qua) or (trinh quang)) thong thong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (chieu sang)) - hanh ((trinh qua) or (trinh quang)) thong thong manh toan ban*.