Search engines are interpreter of our ideas. The best keywords, keywords and relevance get ranked high in the search results.
The best way to get the better of organic search results would be that of creating a genuine content which can read by both search engine crawler and the visitors. The ultimate conversion happens when the visitor who used the search engine like Google, yahoo, MSN and Bing would want to have the best results helping his query.
Once we fix the best content, web navigation and links you are guaranteed the organic sustainability and referential from search engine.