Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong trinh, cong tan
tieu sach » dien sach, te sach, viet sach
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
cua tong » cua cong, cua dong, cua nong
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - thanh trung cua tong cong thanh ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) or (chieu sach)) - thanh trung cua tong cong thanh ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) or (chieu sach)) - thanh trung cua tong cong thanh ((toan cau) OR (toan ban))*.