Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thanh dung » thanh duong, thanh tung, thanh hung
va phuong » va thuong, cac phuong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
van tai » von tai, van tuan

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

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