In the “Search hashtags” feature you can determine whether you’re looking for hashtags related to your base hashtag, the one you’ve typed in, or maybe you’d prefer them to be similar to your one (they’ll include the base hashtag then).
To illustrate that with examples:
- The base hashtag you’ve chosen: puppy
- Hashtags related to your base hashtag: #dog #dogsofinstagram #littledogs #myhomezoo
- Hashtags similar to your base hashtag: #mypuppy #spanishpuppy #thecutestpuppy #lookwhatmypuppydo