I have seen this when google can't quite decide on if the keyword is suitable for the search phrase so it is testing its true position.
The way to combat this is to build a few internal links using the keywords as anchor text. However, don't just spam your own site with 100's of links that can also have a negative effect.
Also on the page itself check your alt text on any images, do they support the keywords in question? H1 tags and page title should also be looked at.
You have posted the link to the search but not told us the site in question. so it's not possible for us to check your site or indeed the page that has the bounce.