Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
thanh van » thanh san, thanh toan, thanh phan
dung cong » dung trong
thanh va » hanh va, thanh ha, thanh ve
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » 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: theo tieu sach - hanh ((((thanh va) OR (thanh van))) or (hang va)) dung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh ((((thanh va) OR (thanh van))) OR (hang va)) dung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh ((((thanh va) OR (thanh van))) or (hang va)) dung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((((thanh va) OR (thanh van))) or (hang va)) dung cong san toan cau*.