easy search keywords from keywords research tool like google adwords keywords tool, SEO book research tool and digital keyword research tool.
Search engines don't follow keywords they index content. People... that's the part you are missing. People follow keywords.
You couldn't be more wrong. Search engines DO follow keywords in anchor text (provided the link is not nofollowed) and then rank a site accordingly.
Another important place to include your keywords in the description section app. Do not spam your description section of your keywords. Just use them properly and everything will be fine.
First search keywords by keywords research tool then check manually in search engine, what have rank on those keywords then use.