Please note that the particular workflow I shared, differently from the one you mentioned (DEVONthink Search), was intended to look only for DEVONthink Groups (not the files inside them). It was actually designed to complement it (I use it a lot too!). One further and important remark, though: any of these workflows will need a DEVONthink "PRO" license to fully operate because AppleScript is required. This is the case with the dknd trigger in the DEVONthink Search workflow (but not with dnk, which simply uses Alfred's internal file search mechanism with Spotlight indexed files). Finally, make sure you have your databases indexed if you want to use this latter workflow (Database properties -> Create Spotlight index).