In such cases, a visual file manager like Thunar is quite handy. 

If your system hasn't a GUI, tools like the midnight-commander help a lot.

In simple cases, using command completion might be sufficient. 

     rm -i Einf→→

where the → shall symbolize the Tab-key. 

If you're not allowed to install such modern stuff, find might help:

With 

    ls -la Ein*

you can investigate file attributes, like size, modification time, owner, attributes, ... to feed to find: 

    find -maxdepth 1 -type f -name "Einf*hrung *chemie" -mtime -4 -mtime +2 -size +2000 -size -2200

If the result is just that one specific file, add the delete switch. This works not with all sorts of find, but with GNU-find:

    find -maxdepth 1 -type f -name "Einf*hrung *chemie" -mtime -4 -mtime +2 -size +2000 -size -2200 -delete

For other find versions, you'll find a lot of examples, how to delete files, here, too.