Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung quang » truong quang, trong quang, trung quan
dung phuong » dung thuong, bang phuong, dung chung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
quang dung » quang trung, ung dung, cuong dung
dan toan » van toan, dan than, manh toan
ban hang » ngan hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - thanh trung quang dung phuong ((dan toan) or (ban hang)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh trung quang dung phuong ((dan toan) OR (ban hang)) cao.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trung quang dung phuong ((dan toan) or (ban hang)) cao*.