If you have added topics to "Excluded Topics", those who selected these topics will never match with you. Both of you will be hidden on each other's matching list, no matter via Auto-match or Explore Manually. Besides, others will not be able to know what topics you have excluded.
To exclude topics, please follow these steps.
- Go to My Profile (rightest tab, bottom menu)
- Scroll down to Excluded Topics under Interested Topics
- Tap on the word Manage
- Select the topics then Save (top right corner)