Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh phan » trinh quan, thanh phan, trinh toan
hoang manh » hoang minh, hoang anh, hoang xanh
trinh han » trinh quan
nong manh » nong lanh, duong manh, luong manh
ho chieu » theo chieu, hoc thieu, mot chieu
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 - hanh ((trinh phan) OR (trinh han)) chung ((nong manh) or (hoang manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((trinh phan) OR (trinh han)) chung ((nong manh) OR (hoang manh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trinh phan) OR (trinh han)) chung ((nong manh) or (hoang manh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trinh phan) OR (trinh han)) chung ((nong manh) or (hoang manh)) toan cau*.