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Vocabulary.
Stumble onto
This is a verb that says :
To find something unexpectedly / To trip over someone
"While looking for my car keys in rucksack I stumbled onto my pen that I had lost previously" "Once upon a time, there was this huge family with 7 members. Everytime they were on a trip, they always stumbled onto each other to get out of the car."
Extra vocabulary.
Wander around
This is a phrase to say:
Strolling/walking/doing something without any purpose evident
"So I got to the building and I was just wandering around, looking for the toilet because there weren't any signs"