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 luc mo" » "dung tai luan van. hoat dong luc mo", "dung tren luan van. hoat dong luc mo", "dung sai luan van. hoat dong luc mo", "dung tri quan van. hoat dong luc mo", "dung thi luan van. hoat dong luc mo", "dung tri tuan van. hoat dong luc mo", "dung tri luan van. hoat nang luc mo", "dung tri luan van. hoat dong luc moi", "dung tri luan van. hoat dong duc mo"

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