Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
canh manh » lanh manh, canh tranh, cach mang
bang cong » dang cong, hang cong, dung cong
bang song » nang song
manh cua » doanh cua, ban cua
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: doi chieu sach - canh manh cua ((bang cong) or (bang song)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh manh cua ((bang cong) OR (bang song)) tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh manh cua ((bang cong) or (bang song)) tinh toan cau*.