Perhaps you should try some spelling variations:
"nhung thoi luan van. hoat dong co moinit" » "nhung thi luan van. hoat dong co moinit", "phung thi luan van. hoat dong co moinit", "nhung loi luan van. hoat dong co moinit", "nhung hoi luan van. hoat dong co moinit", "nhung thai luan van. hoat dong co moinit", "nhung thoi luan van. hoat cong co moinit", "nhung thoi luan van. hoat dung co moinit"
"nhung bai que van. moi truong hoc mon" » "nhung bai que van. moi trung hoc mon", "nhung bai que van. moi tuong ho mon", "nhung bai que van. moi truong bo mon", "nhung bai qua van. moi truong hoc mon", "nhung bai quy van. moi truong hoc mon", "nhung bai quyet van. moi truong hoc mon", "nhung bai que van. moi truong hoc moi", "nhung bai que van. moi truong hoc mot", "nhung bai que van. moi truong hoc cong"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi luan van. hoat dong co moinit") or ("nhung bai que van. moi truong hoc mon"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung thoi luan van. hoat dong co moinit") OR ("nhung bai que van. moi truong hoc mon")).
• Removing quotes may allow a broader search: (( nhung thoi luan van. hoat dong co moinit ) or ( nhung bai que van. moi truong hoc mon )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. hoat dong co moinit") or ("nhung bai que van. moi truong hoc mon"))*.