Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
dong thanh » truong thanh
doi chieu » doc hieu, doi chi, ho chieu
quan hanh » quan thanh, quang thanh, quang khanh
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan lap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh trinh quan hanh ((cong tan) or (dong thanh)) ((phan cau) OR (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh trinh quan hanh ((cong tan) OR (dong thanh)) ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh quan hanh ((cong tan) or (dong thanh)) ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh trinh quan hanh ((cong tan) or (dong thanh)) ((phan cau) OR (phan tu))*.