The latest update to Google Search—which is Google Now—includes the ability to switch languages on the fly. This means that "spanglish", or any other popular combination of languages, will be understood in context by Google's search engine.
The feature is live, so give it a shot for yourself. With recent additions of parking location tracking, bill reminders, and a stellar World Cup tracker, Google Now just continues to get better and better. Let us know what you think of the latest addition in the comments below.