I am having this same issue. I have offline search enabled on my folders but when I search for a word that is in my note nothing comes up. However if I used tag:"tag name" as the search function, notes with that tag came up. The funny thing is I was in a doctors office touting how awesome Evernote is. But when I needed it to recall specifics about a prescription, Evernote was no better than my gray matter.
Does "evernote:///" do anything on a mobile device? I scan the QR code that I generated using the "evernote:///" style of address. I thought it would open Evernote Android (in my case), but it does not. It doesn't even open a browser and take me to my note via a mobile web brower. What good is it again?