… a challenge.
I came up with a brutish answer if you happen to be a firefox user, but first of all, I just want to double check that you only wanted to find suttas including the exact phrase:
ekaṃ samayaṃ bhagavā sāvatthiyaṃ viharati jetavane anāthapiṇḍikassa ārāme
When I searched for this using double quotes I only got 230 results. It was only when I searched for the phrase without using quotes that 3,615 results were returned.
Anyway my brutish answer:
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add “&limit=230” to the end of the results url so they’re all shown on one page (SuttaCentral)
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install/use the DownThemAll! plugin
2.1) under the Fast Filtering enter “t/pi/” to isolate just the suttas
2.2) hit start and they will be downloaded to wherever you selected on your computer as html files which can be opened (as local files) in your browser.