Perhaps you should try some spelling variations:
trung thanh » truong thanh
chieu sach » chinh sach, chieu sang, chieu xanh
trung tham » trung tam, trung thang, trung ha
thong cong » trong cong, tong cong, thong thong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chiet tach)) - thanh ((trung tham) OR (trung thanh)) thong cong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - thanh ((trung tham) OR (trung thanh)) thong cong dan phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chiet tach)) - thanh ((trung tham) OR (trung thanh)) thong cong dan phan tu".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chiet tach)) - thanh ((trung tham) OR (trung thanh)) thong cong dan phan tu*.