Perhaps you should try some spelling variations:
trung quan » truong quan, trung tuan, truong quang
trong quan » thong quan, tong quan, thong quang
nhung cong » dung cong, thong cong, hang cong
chu sach » cau sach, thu sach, chieu sach
hau sach » khau sach, cau sach, ham sach
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
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: theo ((chu sach) or (hau sach)) - thanh ((trung quan) OR (trong quan)) nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sach) OR (hau sach)) - thanh ((trung quan) OR (trong quan)) nhung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sach) or (hau sach)) - thanh ((trung quan) OR (trong quan)) nhung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sach) or (hau sach)) - thanh ((trung quan) OR (trong quan)) nhung cong dan than cau*.