Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tranh cua » doanh cua, manh cua
cua khong » hua khong, cua phuong, cua thuong
cuong tap » luong tap, cong tac, luong tai
ho chieu » theo chieu, hoc thieu, mot chieu
cong tap » cong tac, cong tan, tong tap
quan cau » quang cao, toan cau, quan ha

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 (doi chieu)) sach - canh tranh cua khong ((cong tap) OR (cuong tap)) quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - canh tranh cua khong ((cong tap) OR (cuong tap)) quan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - canh tranh cua khong ((cong tap) OR (cuong tap)) quan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - canh tranh cua khong ((cong tap) OR (cuong tap)) quan cau*.