Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
thong cong » trong cong, tong cong, thong thong
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
chan cao » chan cho, chat cao, toan cao
chay cao » cay cao, chat cao, nha cao

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