Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh lang » nhanh quang, nhanh thang, nhan dang
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, cong san, dong san
ho chieu » theo chieu, hoc thieu, doi chieu
toan cau » toan cao, toan ban, toan tap
lang va » lang van, hang va, lang ha
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - nhanh lang va dung ((trong dan) OR (trong san)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - nhanh lang va dung ((trong dan) or (trong san)) toan cau*.