In another thread there is a discussion about one day Faithlife providing support for searching multiple sites at once (e.g., Logos and Vyrso).
Until that happens, I developed a workaround for the Mac (Someone could do the same for Windows, I am sure). It's an AppleScript that pops up a search term box, and then opens and searches several Faithlife websites in Safari.
4578.SFW-Search Faithlife Websites.app.zip
All I do is type "SFW" in Spotlight to activate it.
For those interested, here is the script (not all original to me). You would need to copy it to a new AppleScript, then save it as an application:
2117.SFW script.txt