Perhaps you should try some spelling variations:
"phung thi dua van. con duong uoc mo" » "phung thi dua van. van duong uoc mo", "phung thi dua van. con huong uoc mo", "phung thi dua van. con duong hoc mo", "phung thi dua van. con duong nguoc mo", "phung thi dung van. con duong uoc mo", "phung thi duy van. con duong uoc mo", "phung thi dua vao. con duong uoc mo", "phung thi duc van. con duong uoc mo"
"dung tri luan van. hoat dong hoc mo" » "dung tai luan van. hoat dong hoc mo", "dung tren luan van. hoat dong hoc mo", "dung sai luan van. hoat dong hoc mo", "dung tri quan van. hoat dong hoc mo", "dung thi luan van. hoat dong hoc mo", "dung tri tuan van. hoat dong hoc mo", "dung tri luan van. hoat dong co mo", "dung tri luan van. hoat dong luc mo", "dung tri luan van. hoat dong hoc moi", "dung tri luan van. hoat dong hoc mot", "dung tri luan van. hoat dong hoc mon"

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: (("dung tri luan van. hoat dong hoc mo") OR ("phung thi dua van. con duong uoc mo"))~.
• Removing quotes may allow a broader search: (( dung tri luan van. hoat dong hoc mo ) or ( phung thi dua van. con duong uoc mo ))~.
• Adding a wildcard symbol may retrieve word variants: (("dung tri luan van. hoat dong hoc mo") or ("phung thi dua van. con duong uoc mo"))*.