I used to find long tail keywords directly via search engines or according to my feel about keywords. Do you know any ways to do keyword research and find best long tail keywords for your articles?
You can do some researches for the reference but I would suggest you try google keyword planner or some following tools like
- Google Adwords' Keyword Tool
- Wordtracker’s Free Basic Keyword Demand
- Google Trends Keyword Demand Prediction
- Microsoft Advertising Intelligence
- Google Insights for Search
In my point of view, Google's AdWords Keyword tool is a good tool for keywords research. It provided you more featured aroud the keyword you want to target, such as estimated search volume, CPC..etc. Go and see which you will get with this tool.