Access Term Store in different Site collection
Copy the Site collection url of the term store which you want to access in different site.
Open term store of the target site collection
Ex:https://SP2013/MySiteCollection/_layouts/15/termstoremanager.aspx
Click on the Term set group under System
You can find: Site Collection Access
Paste the site collection url, which you want get term stores in this site collection
Copy the Site collection url of the term store which you want to access in different site.
Open term store of the target site collection
Ex:https://SP2013/MySiteCollection/_layouts/15/termstoremanager.aspx
Click on the Term set group under System
You can find: Site Collection Access
Paste the site collection url, which you want get term stores in this site collection