Perhaps you should try some spelling variations:
thanh trung » thanh tung
quan trong » gian trong
thien anh » thien danh, tien anh, thien thanh
tien manh » tien anh, tien thanh, tieng anh
qua trong » qua trinh, qua song, qua cong
dan thanh » dang thanh, danh thanh, ban thanh
cong dan » cong san, cong tan, huong dan

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 anh) or (tien manh)) - thanh trung ((qua trong) OR (quan trong)) cong dan thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (tien manh)) - thanh trung ((qua trong) OR (quan trong)) cong dan thanh san.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) or (tien manh)) - thanh trung ((qua trong) OR (quan trong)) cong dan thanh san".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) or (tien manh)) - thanh trung ((qua trong) OR (quan trong)) cong dan thanh san*.