Or use,

  allintitle: attaching a prehung door

But it seems that allintitle can only be used at the beginning of a query, so there's no way to combine it with non-title keywords.

Engines supporting parentheses like Reddit's or Elasticsearch prevail here:

  title:(attaching a prehung door)

But for some reason that doesn't work in Wikipedia's search, even though CirrusSearch is based on Elasticsearch.