Have you talked with your boss? Different people have different learning styles and different sets of knowledge. Some people prefer to learn by working through things with Google, StackOverflow, etc. Others would rather pick up some books. Others would rather go to a training class, a conference, or something else. Don't assume that your boss knows how you best learn.
Generally, coming to your boss with a solution works better than coming to him with a problem. For example, it's generally a lot more productive to bring a well thought out plan
Hey boss, as you know, I'm trying to get up to speed with X and Y for
the Smith project. I can work through it on my own but it would be a
lot more efficient for me if I could go to a training class on X so
that I understand the theory a better and so that I can make sure that
I'm doing things the right way. There is a 5-day class in X coming up
at the training center down the road that costs $$. Is that something
that we might be able to get into the training budget? If not, there
is also a local conference in X coming up at the local community
college that's a lot less expensive. I'd need to get a couple days
off to attend.
than to just dump a problem in his lap. Of course, this requires that you do the leg work of identifying what you need, identifying options that would work for you and the company. The more expensive your preferred option, the more likely you'd want to have acceptable alternatives available.
When you're thinking about options, don't forget about internal options as well. If there are a number of people learning X at the same time, perhaps you can organize some "lunch and learn" sessions where everyone takes a turn digging in to one aspect or another and presenting their research to the team. Or perhaps there is someone in the company that is an expert in X and you just need your manager to get some of that expert's time to do some teaching.