Perhaps you should try some spelling variations:
trung duong » trung uong, trung dung, trung dong
chieu sach » chinh sach, chiet tach, chieu sang
dung quang » dang quang, dung quan, luong quang
trung hung » trung dung, trong hung, truong chung
doi chieu » doc hieu, doi chi, mot chieu
hanh dung » thanh dung, anh dung, hanh dong
thanh lap » thanh san, phan lap, thanh hai
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 ((trung hung) or (trung duong)) 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 ((trung hung) OR (trung duong)) dan ((khan cap) OR (thanh lap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh dung quang ((trung hung) or (trung duong)) dan ((khan cap) or (thanh lap))*.