Perhaps you should try some spelling variations:
luong quang » luong quan
chieu sach » chinh sach, chiet tach, chieu sang
dung quang » dang quang, dung quan, dung luan
doi chieu » doc hieu, doi chi, mot chieu
thanh lap » thanh san, phan lap, thanh hai
uong dan » huong dan, tuong dan, xuong dan
khan cap » khan ap, than cap, khoan cam

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 - hanh ((dung quang) or (luong quang)) trung uong dan ((khan cap) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((dung quang) OR (luong quang)) trung uong dan ((khan cap) OR (thanh lap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((dung quang) or (luong quang)) trung uong dan ((khan cap) or (thanh lap))*.