Introduce the primary keyphrases on the landing page. Develop sub-level pages that enforce your keyphrase targets. Don't hesitate to use all kinds of words variables (altered prefixes/suffixes, plural forms, acronyms etc.), synonymous keyphrases, antonyms etc. throughout your web presentation so as to avoid repetition and to create the illusion that you have created something that is intelligently written. The search engines like that; naturally well crafted content, things that appear to be intelligently put together with the intent to capture the attention of the Internet visitor and not exclusively the search engine's.