Perhaps you should try some spelling variations:
thanh trung » thanh tung
trinh than » trinh thanh, trinh han, trinh toan
dinh sach » tinh sach, chinh sach, dinh cac
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 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: hoc ((dinh sach) OR (sinh sach)) - thanh trung ((cua phung) or (cua chung)) cong trinh than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dinh sach) OR (sinh sach)) - thanh trung ((cua phung) OR (cua chung)) cong trinh than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((dinh sach) OR (sinh sach)) - thanh trung ((cua phung) or (cua chung)) cong trinh than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((dinh sach) OR (sinh sach)) - thanh trung ((cua phung) or (cua chung)) cong trinh than cap*.