Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sach » chinh sach, chiet tach, chieu sang
trung tran » trung tuan, trung tam, hung tran
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
tap quang » tap quan, tac quang, tao quang
tai quang » thai quang, mai quang, cai quang

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