Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
cong thanh » dong thanh, cong trinh, cong tan
bien tinh » bi tinh, yen tinh, diep tinh
cong manh » cong danh, duong manh, hoang manh
tinh cua » trinh cua, sinh cua, tinh chat
cua tong » cua cong, cua dong, cua nong
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 sach) or (bien tinh)) - nhanh tinh cua tong ((cong manh) OR (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (bien tinh)) - nhanh tinh cua tong ((cong manh) OR (cong thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (bien tinh)) - nhanh tinh cua tong ((cong manh) OR (cong thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (bien tinh)) - nhanh tinh cua tong ((cong manh) OR (cong thanh)) toan cau*.