Increase the reliability of Acrobat XI OCR?

I wrote this in the Illustrator forum:
I've got a PDF that seems to open OK in Illustrator, it was originally produced by a CAD program:
http://www.bavariayacht.info/downloads/Schematic%20Panel%2020.pdf
However, none of the text is rendered as text, instead each character is made up of a multitude of paths.
Is there anything I can do to fix this?
I have since run the OCR in Acrobat XI, and it finds some of the text, but not all.
Is there a way to increase the reliability of the OCR?

To get better OCR you need better originals! (So not applicable)
It is made for solid paragraphs, not free labels.

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