Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trong van » trong cac
manh cua » doanh cua
van toan » van tuan, van tan, van 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)) dung trong van toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh ((manh cua) OR (ban cua)) dung trong van toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh ((manh cua) OR (ban cua)) dung trong van toan cau*.