Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu xanh » chieu sang, chieu tinh, hieu manh
dung duong » dung dong, dong duong, dung dung
duong manh » duong van
hanh dang » hanh dong, hanh dung, hanh mang
manh toan » thanh toan, anh tuan, tinh toan
anh dang » anh dong, anh dung, anh bang
cua dung » cua dang, cua dong, qua dung
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: hoc ((chieu sach) or (chieu xanh)) - ((hanh dang) or (anh dang)) cua dung duong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu xanh)) - ((hanh dang) OR (anh dang)) cua dung duong manh toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu xanh)) - ((hanh dang) or (anh dang)) cua dung duong manh toan cao*.