Filters and Sorting will help you search and organize your contacts in whatever way that works for you.

Navigate to the Relationships tab and tap on the Filter/Sort icon at the top left corner of the screen. 

You can filter your contacts by One Time Reminder, Tagged, Untagged, No Reminders, No Description and Has Birthdays

You can sort your contacts by Last Name, Last Connected, Reminder Date, Last Updated, Company and Email Domain. 

You can also toggle between Ascending and Descending

At the end, don't forget to tap on apply for your new filtered list.