Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
viet thanh » viet anh
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: khoa ((chiet tach) or (viet thanh)) - thanh trung cua dung cong san ((than cau) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoa ((chiet tach) OR (viet thanh)) - thanh trung cua dung cong san ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "khoa ((chiet tach) or (viet thanh)) - thanh trung cua dung cong san ((than cau) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: khoa ((chiet tach) or (viet thanh)) - thanh trung cua dung cong san ((than cau) OR (than cap))*.