Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong cong » phuong dong, phong cong, phung cong
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
trung cua » truong cua, trung tuan, trung cap
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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

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