Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
trung cap » truong cao
cong sang » cong san, cong lang, cong vang
sang than » cang thang, dang thanh, sang tao
ho chiet » ho chieu, ho thiet, hoc thiet
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - thanh ((trung cap) or (trung tam)) nhung cong sang than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh ((trung cap) OR (trung tam)) nhung cong sang than cau.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh ((trung cap) or (trung tam)) nhung cong sang than cau*.