Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu xanh » chieu sang, chieu tinh, hieu manh
tang quang » dang quang, tang quan, hang quang
quang dung » quang trung, ung dung, cuong dung
hanh tang » hanh trang, anh tang, hanh mang
trong dan » trong dang, trong san, trong tan
dan toan » van toan, dan than, manh toan
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) or (chieu xanh)) - hanh tang quang dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu xanh)) - hanh tang quang dung trong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chieu xanh)) - hanh tang quang dung trong dan toan cau*.