So in response to a vague and ambiguous query, you got highly relevant results including the one you wanted on the first page. And you're complaining about that

So in response to a vague and ambiguous query, you got highly relevant results including the one you wanted on the first page. And you're complaining about that? Incidentally, the R Programming Language manual contains stuff like this: pdf() Produces a PDF file, which can also be included into PDF files. so it's quite relevant too. Admittedly, there are probably a few bogus results here due to incoming links like "Download the PDF file here". But given how vague your query was, and how common PDF documents are, it's remarkable that Google did so well. Before your next post you might like to read up on search engines, tf/idf, pagerank, and what 'relevancy' actually means. The only irrelevant thing here is your complaint.