Perhaps you should try some spelling variations:
"phung thi duc van. con duong hoc mo" » "phung thi duc van. van duong hoc mo", "phung thi duc van. con dung hoc mo", "phung thi duc van. con duong hoi mo", "phung thi duc van. con duong ho mo", "phung thi cuc van. con duong hoc mo", "phung thi dua van. con duong hoc mo", "phung thi du van. con duong hoc mo", "phung thi duc va. con duong hoc mo", "phung thi duc tan. con duong hoc mo", "phung thi duc manh. con duong hoc mo", "phung thi duc van. con duong hoc moi", "phung thi duc van. con duong hoc mon", "phung thi duc van. con duong hoc ma"
"nhung bai quan luan. hoat dong hoc mot" » "nhung hai quan luan. hoat dong hoc mot", "nhung ban quan luan. hoat dong hoc mot", "nhung mai quan luan. hoat dong hoc mot", "nhung bai quan luan. hoat dong co mot", "nhung bai quan luan. hoat dong luc mot", "nhung bai quan luan. hoat dong hoc moi", "nhung bai quan luan. hoat dong hoc moit", "nhung bai quan luan. hoat dong hoc mont", "nhung bai quan luan. hoat dong hoc mat"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung bai quan luan. hoat dong hoc mot") OR ("phung thi duc van. con duong hoc mo"))~.
• Removing quotes may allow a broader search: (( nhung bai quan luan. hoat dong hoc mot ) or ( phung thi duc van. con duong hoc mo ))~.
• Adding a wildcard symbol may retrieve word variants: (("nhung bai quan luan. hoat dong hoc mot") or ("phung thi duc van. con duong hoc mo"))*.