Perhaps you should try some spelling variations:
thang cong » thanh cong, thang long, thong cong
cong quang » luong quang, thong quang, duong quang
doi chieu » doc hieu, doi chi, mot chieu
quang con » quang cuong, quang chan, quang dong
con duong » van duong
duong tan » duong tuan, duong van, duong tai
tan van » tran van, tang van, luan van

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) or (toc thieu)) sach - thang cong quang con duong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - thang cong quang con duong tan van ban.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sach - thang cong quang con duong tan van ban*.