Perhaps you should try some spelling variations:
trinh tinh » trinh kinh, trinh dinh, trinh sinh
thanh tung » thanh cong
cho truong » cac truong, thi truong, bo truong
trinh tin » trinh kinh, trinh toan, trinh tu
dang tran » dang thanh, quang tran, hoang tran
tung cho » dung cho, tung ho, tang cho
dang tan » dang toan, dang van, dang dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((trinh tinh) OR (trinh tin)) - thanh tung cho truong ((dang tan) or (dang tran)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((trinh tinh) OR (trinh tin)) - thanh tung cho truong ((dang tan) OR (dang tran)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((trinh tinh) OR (trinh tin)) - thanh tung cho truong ((dang tan) or (dang tran)) van ban".
• Adding a wildcard symbol may retrieve word variants: doc ((trinh tinh) OR (trinh tin)) - thanh tung cho truong ((dang tan) or (dang tran)) van ban*.