"I had been playing the accordion Davy lent to
Rosie during winter break"
"The language they're using is not that different
from the one I wrote PlayGUI to use"
"I've been playing a decent amount of music lately,
mostly guitar and piano."
"warm dry socks was the most important aspect of the
festival"
"This wouldn't be that bad, if it was not exactly what
happened a year and a half ago."
Google found all three. For each one there were either 2 or 3 results: first my old post, then one or two from rssing.com which seems to do something with my rss feed.Trying them with Bing, it also found all five of my posts, and ranked them first in four cases. In the fifth case ("This wouldn't be that bad, if it was not exactly what happened a year and a half ago.") it ranked a goodhousekeeping.com post higher, which had all the individual words but none of the phrases.
(Disclosure: I work for Google, though not in search.)