Another method of finding alternate keywords to use for anchor text is to find synonyms of your main keyword phrase.
There are several methods to find synonyms for your search term. You could use a Thesaurus. You could use a tool like the Google® Sandbox Tool.
You could use Wordtracker , which will find similar words and help with your keyword research. (To read more about Wordtracker check out my review of it on my SEO Software Reviews page http://websitepromotionbook.com/seo_software_reveiws.html.
Another way to find synonyms is to enter your main keyword into a Search Engine and look at the pages that come up. You can determine which alternate words for your keywords the Search Engine finds, by glancing through some of the results.