Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran quang, tran hoang, tran huu
tran hong » tran hoang, tran trong, tranh hang
cuong tap » luong tap, cong tac, luong tai
tap doan » tap quan
doan cau » toan cau, doan dau, doan cap

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 - anh quang ((tran hung) or (tran hong)) cuong tap doan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh quang ((tran hung) OR (tran hong)) cuong tap doan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang ((tran hung) or (tran hong)) cuong tap doan cau*.