Perhaps you should try some spelling variations:
"nhung thoi quan luan. noi dung hoc moi" » "nhung thi quan luan. noi dung hoc moi", "phung thi quan luan. noi dung hoc moi", "nhung loi quan luan. noi dung hoc moi", "nhung thoi quen luan. noi dung hoc moi", "nhung thong quan luan. noi dung hoc moi", "nhung thoi quan luan. hoc dung hoc moi", "nhung thoi quan luan. noi dong hoc moi", "nhung thoi quan luan. noi dung thuoc moi", "nhung thoi quan luan. noi trung hoc moi", "nhung thoi quan luan. noi dung hoc noi"
"ung hoa luan van. hoc dan hoc mot" » "ung khoa luan van. hoc dan hoc mot", "ung hoa quan van. hoc dan hoc mot", "ung hoa dan van. hoc dan hoc mot", "trung hoa luan van. hoc dan hoc mot", "dong hoa luan van. hoc dan hoc mot", "hang hoa luan van. hoc dan hoc mot", "ung hoa luan van. hoc van hoc mot", "ung hoa luan van. hoc dan toc mot", "ung hoa luan van. hoc dai hoc mot"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ung hoa luan van. hoc dan hoc mot") or ("nhung thoi quan luan. noi dung hoc moi"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("ung hoa luan van. hoc dan hoc mot") OR ("nhung thoi quan luan. noi dung hoc moi")).
• Removing quotes may allow a broader search: (( ung hoa luan van. hoc dan hoc mot ) or ( nhung thoi quan luan. noi dung hoc moi )).
• Adding a wildcard symbol may retrieve word variants: (("ung hoa luan van. hoc dan hoc mot") or ("nhung thoi quan luan. noi dung hoc moi"))*.