Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh danh » hanh doanh, han danh, anh danh
dung cong » dung trong
luan hoan » luan van
danh qua » hanh qua, doanh quan, manh quan
qua dung » quang dung, su dung, qua song
ban chat » van chat, bao chat, luan chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (chieu sach)) - hanh danh qua dung cong ((ban chat) or (luan hoan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chieu sach)) - hanh danh qua dung cong ((ban chat) OR (luan hoan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (chieu sach)) - hanh danh qua dung cong ((ban chat) or (luan hoan)) cao*.