Perhaps you should try some spelling variations:
mot chieu » ho chieu
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, 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: ((mot chieu) or (doi chieu)) sach - hanh tang ((cua dung) OR (cua dong)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doi chieu)) sach - hanh tang ((cua dung) OR (cua dong)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chieu)) sach - hanh tang ((cua dung) OR (cua dong)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doi chieu)) sach - hanh tang ((cua dung) OR (cua dong)) cong dan toan cau*.