I don't know what the newer version does, but in an older version of iOS Gospel Library, on the search page, there were three buttons at the top of the page.
If I selected "phrase", I got "go and do", but if I left it at the default, I only got verses with the word go or the word do in them, but not both, so 1 Ne 3:7 was not picked up. It was as if the search was for "go" or "do", not "go and do", or even "go" and "do".