Perhaps you should try some spelling variations:
duong cuong » duong cong, duong vuong, duong truong
thanh tran » thanh trang, thanh toan, thanh tra
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
van duong » van dong, van dung, van phong
manh toan » thanh toan, anh tuan, tinh toan
tran van » luan van
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: doc ((hieu sach) OR (hieu cach)) - thanh tran van duong cuong ((manh toan) or (ban hang)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cach)) - thanh tran van duong cuong ((manh toan) OR (ban hang)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) OR (hieu cach)) - thanh tran van duong cuong ((manh toan) or (ban hang)) ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) OR (hieu cach)) - thanh tran van duong cuong ((manh toan) or (ban hang)) ban*.