I've noticed that the search does not return expected results when searching on the content of a document, but does return the expected results if I search using the title of the document.
To test I uploaded a document, ran an incremental crawl, opened the document, copied a line of the text and pasted it into the search box. This did not return any results that included the uploaded document. I then took a copy of the documents title from the title column and pasted it into the search box. This returned the document as expected.
Can anyone explain why this happens