Hi guys,
We are all know the important use of keywords in the whole process of SEO effectiveness optimization. I have been listed at Google, Bing, and MSN. The only thing that is left for me to aim for is to get listed at Yahoo and have their indexing system rank me.
I want to know what keywords I should be use? I want to be immediately accepted the moment I submit my indexing application.
I hope you will provide me better suggestions.

See, the techniques don't differ for search engines. You have to optimize your website the same way you did for other SE's. Infact you have an advantage. Yahoo indexing is bit slower but since you have already been listed in Bing, your chances of getting indexed in Yahoo get better (post the Yahoo and Bing merging).

For a good ranking in Yahoo, submit your Sitemap to Yahoo! search engine and keep building backlinks. And since Yahoo results are powered by Bing, check out these guidelines,
http://www.bing.com/community/site_blogs/b/webmaster/archive/2009/09/03/search-engine-optimization-for-bing.aspx