Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
trung van » truong van, trong van, trung va
van nhung » van nhuong, va nhung, van hung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (thi thanh)) - thanh trung van nhung ((cong dan) OR (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thi thanh)) - thanh trung van nhung ((cong dan) OR (cong san)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (thi thanh)) - thanh trung van nhung ((cong dan) OR (cong san)) chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (thi thanh)) - thanh trung van nhung ((cong dan) OR (cong san)) chan cau*.