Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
chiet tach » chieu sach
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
ho chiet » ho chieu, ho thiet, hoc thiet
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, dan than, 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 chiet tach - hanh ((tinh cua) or (trinh quan)) tong cong ((dan toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh ((tinh cua) OR (trinh quan)) tong cong ((dan toan) OR (manh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh ((tinh cua) or (trinh quan)) tong cong ((dan toan) or (manh toan)) cau*.