Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong thanh » dong thanh, cong trinh, cong tan
thanh than » thanh thanh, thanh thang, thanh toan
kinh sach » dinh sach, tinh sach, chinh sach
sinh sach » chinh sach, sinh san, sang sach
cua phung » cua phuong, cua nhung, cua thuong
cua chung » cua nhung, luan chung, luat chung
than cau » toan cau, phan cau, than cap

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

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