How to search man page (pdf file)

I'm not sure is it just only me or something.
I try to download man page documentation from SUN.COM. However, it seems I can't search what I looking for in SUN man page.

I try to search "passwd" but it return me a word "less"

why this pdf can't search or is it require specific plugin to decrypt the search function please?

What viewer are you using to see the pdf?

Are you using openoffice?

Can you tell what URL you use to search and the reference of the document you got ?