I would look to some of the other free keyword tools for additional insights and ideas. http://freekeywords.wordtracker.com will give you a different take than Market Samurai because of methodologies and data.
Also the Google Adwords tool can be revealing: https://adwords.google.com/select/KeywordToolExternal
Use a thesaurus to try different words that mean the same thing.
I wouldn't try to optimize for words with massive competitors. The long-tail keywords are easier to dominate and often show more buying intent. One of my presentations, I talk about some realtor customers: a search of "Naperville real estate" could be motivated by anything. But when people search on "Naperville Cape Cod home with 3 bedrooms" that is likely a buyer.
-- Kurt Scholle
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