Hello Remco
Thanks for the question. The best way to ensure Google associates your page(s) with a specific keyword or phrase is via the following:
Title – This is very important include Trageted Keyword in Page Title
URL – If at all possible ensure the keyword or phrase is a part of your domain url
Page Text – Include the keyword within you page text several times (not consecutively) with your page.
Link Exchange – Exchange links with pages and sites that are ranked at Google for the keyword or term you are targeting.
These steps should definately help.