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Ideally you would like to have one keyword focus per page with the very relevant unique content on said page and inner linked correctly.  Of course when the keywords are similair then you might stray towards having very similair pages which can lead to duplicate content/keyword cannabilism. Think of it from a users point of view - would the 2 keyword's content make more sense on one page or do they need their own seperate page? Your goal should be to create a page/site that would be the authority on a given subject/keyword and I believe that if you think of it from the user/visitors point of view first you can't really go too far wrong