For all the people who are wondering how to get bulk amount of related hashtags, check out this tool. Actually its not a tool like website, its a free software.
The approach with 70-80% more specific and 20-30% more popular hashtags is great! I’ve read that few days ago when I read the course of the Jarvee software itself. I recommend everyone to read it, newbie or pro - this is really good knowledge, a lot of basic stuff, but very detailed. And its for free!