Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
tieu sach » chieu sach, dien sach, te sach
hanh tang » anh tang, hanh mang, hanh tung
cua nhung » va nhung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
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 tang) OR (hanh trang)) cua nhung ((cong tan) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh tang) OR (hanh trang)) cua nhung ((cong tan) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - ((hanh tang) OR (hanh trang)) cua nhung ((cong tan) or (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh tang) OR (hanh trang)) cua nhung ((cong tan) or (cong tac)) toan cau*.