Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
sinh cua » manh cua, dinh cuu, sinh va
san toan » van toan, dan toan, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh ((sinh cua) or (trinh quan)) nhung cong ((san toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh ((sinh cua) OR (trinh quan)) nhung cong ((san toan) OR (manh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh ((sinh cua) or (trinh quan)) nhung cong ((san toan) or (manh toan)) cau*.