Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
cong thanh » dong thanh, cong trinh, cong tan
chieu sang » chieu sach, chieu xanh, nhieu tang
hang luong » nang luong, hang thuong, hoang vuong
hieu lang » hieu quang, nhieu tang, hieu van
thanh van » thanh san, thanh toan, thanh phan
van hang » van khang, van hoang, van thang
luan ban » luan van, luan han, luat ban
luan san » luan van, luan hoan, luan phan

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 sang) or (hieu lang)) - cong thanh van hang luong quang ((luan ban) OR (luan san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - cong thanh van hang luong quang ((luan ban) OR (luan san)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - cong thanh van hang luong quang ((luan ban) OR (luan san))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - cong thanh van hang luong quang ((luan ban) OR (luan san))*.