Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
mang vat » dang vat, bang vat, cang vat
vat dung » van dung, va dung, viet dung
cong tan » cong tac, cong san, cong thanh
tan chat » van chat, tao chat, ban chat
chat ban » nhat ban, chat ran, cua ban

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 (chiet tach)) - hanh mang vat dung cong tan chat ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh mang vat dung cong tan chat ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh mang vat dung cong tan chat ban*.