Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
canh manh » lanh manh, cach mang, van manh
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
toan cao » toan ban, toan tap

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)) - ((canh manh) OR (canh tranh)) cua bang cong thanh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cach)) - ((canh manh) OR (canh tranh)) cua bang cong thanh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cach)) - ((canh manh) OR (canh tranh)) cua bang cong thanh toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cach)) - ((canh manh) OR (canh tranh)) cua bang cong thanh toan cao*.