mobile

Hi, I'm trying to read a PDF downloaded from Google books.
I can open it with the nook reader but it doesn't open in full screen so there's a grey background and the text is too small to comfortably read, changing the text size doesn't seem to make any difference.
I downloaded Google Books app and it looks exactly the same, and it doesn't give me access to the settings to try and zoom in or increase text size.
I've also tried Aldiko, the settings are accessible (hurray!) but don't display properly, so I can only see 'Brightness' and 'Orientation'.
Is there any hope, is there a way to read the book!

Many thanks,
Mat.