[Dev-luatex] LuaTeX manual cannot be searched

Hello, when I search the LuaTeX manual in Acrobat Reader 8 or Apples Preview.app bundled with OS X 10.4.2, I never get any results, even if the word I am searching for definitely exists (since I can read it on the page). Copying from the manual does not work as well; only some weird vertical slashes are copied. Jonathan