Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thong dung » thong cong, thong thuong
doi chieu » doc hieu, doi chi, mot chieu
trung ca » trung cap, truong ca, trung cua
ca thong » ca thuong, cac thong, va thong
dung dat » dung va, dung tai
khan cap » khan ap, than cap, khoan cam
khoan va » doan va, khoa ma, nhan va

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 - thanh trung ca thong dung dat ((khan cap) or (khoan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh trung ca thong dung dat ((khan cap) OR (khoan va)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh trung ca thong dung dat ((khan cap) or (khoan va))*.