Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
tran hung » tran quang, tran hoang, tran huu
tran hong » tran hoang, tran trong, tranh hang
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tac, cong tan
tap quan » tac quan, hai quan
quan ha » quan he

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 - ((nhanh quang) or (anh quan)) ((tran hung) OR (tran hong)) cong tap quan ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((nhanh quang) OR (anh quan)) ((tran hung) OR (tran hong)) cong tap quan ha.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((nhanh quang) or (anh quan)) ((tran hung) OR (tran hong)) cong tap quan ha".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((nhanh quang) or (anh quan)) ((tran hung) OR (tran hong)) cong tap quan ha*.