Ctrl+F (search)

how about a simple search for text function in safari (including PDF)? I really don't think I can go through 695 pages of my online scintific calculator manual (in PDF format) looking for instictions on standard diviation. Wouldn't it be easier to do "Ctrl+F" and type in "standard diviation"? Btw no it does not have an index or a table of contents... Yes I am using my iPhone to type this and yes I will be superpissed if it exists