Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
manh cua » doanh cua
van quan » van ban
cac toan » cac khoan, hach toan, cac thanh
toan cau » toan cao, toan ban, toan tap
ban cua » ban quan

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) or (((ban cua) or (van quan)))) dung trong cac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh ((manh cua) OR (((ban cua) OR (van quan)))) dung trong cac toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh ((manh cua) or (((ban cua) or (van quan)))) dung trong cac toan cau*.