Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
hoang hai » hoang thi, hoang van
ho chieu » theo chieu, hoc thieu, doi chieu
cong hai » cong thai, cong ha, cong tac
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: ((ho chieu) or (hoc hien)) sach - hanh trinh cua thong ((cong hai) OR (hoang hai)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc hien)) sach - hanh trinh cua thong ((cong hai) OR (hoang hai)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc hien)) sach - hanh trinh cua thong ((cong hai) OR (hoang hai)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc hien)) sach - hanh trinh cua thong ((cong hai) OR (hoang hai)) toan cau*.