Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, tranh hang
tieu sach » chieu sach, dien sach, te sach
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
van thanh » ban thanh
van tuan » van quan, van ban, anh tuan
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh hang va dung cong ((manh toan) or (((van thanh) OR (van tuan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh hang va dung cong ((manh toan) OR (((van thanh) OR (van tuan)))) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - thanh hang va dung cong ((manh toan) or (((van thanh) OR (van tuan)))) cau*".