Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
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: toc ((thieu sach) or (chieu sach)) - hanh tranh ((cua nhung) OR (va nhung)) cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sach) OR (chieu sach)) - hanh tranh ((cua nhung) OR (va nhung)) cong van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) or (chieu sach)) - hanh tranh ((cua nhung) OR (va nhung)) cong van toan cau".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (chieu sach)) - hanh tranh ((cua nhung) OR (va nhung)) cong van toan cau*.