It still works. You just need to use the GET API for reliable results.

E.g.

Friends of friends

https://www.facebook.com/search/<id>/friends/friends

Mutual friends of two people

https://www.facebook.com/search/<id1>/friends/<id2>/friends/...

Photos where both people are tagged

https://www.facebook.com/search/<id1>/photos-tagged/<id2>/ph... or

https://www.facebook.com/search/<id1>/photos-of/<id2>/photos...

Photos recommended for a person

https://www.facebook.com/search/<id>/photos-recommended-for

Photos liked by a person

https://www.facebook.com/search/<id>/photos-liked

Photos commented on by a person

https://www.facebook.com/search/<id>/photos-commented

Stories or posts liked by a person

https://www.facebook.com/search/<id>/stories-liked

There's plenty of other words operators and entities

IDs are numerical

Should get you started