What's the best way to match forms of line drawing?

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Hi, I'm building a drawing detector and I would like to search for a drawing done by hand in a static drawing. The idea is to search and match an approximated draw pattern.

I've already tried template matching (with all the available methods) and SURF/SIFT and I had unsatisfactory results.

For example:

The static drawing where I'll do the search:

The form I would like to search for:

The expected output would be:

Thanks!