reverse lookup help plugin for Vim
This plugin needs Vim 7.4 or above.
Write settings as below in your .vimrc.
NeoBundle 'januswel/rlhelp.vim'
Use :RLHelp command to look up topics in help with your interest words.
:RLHelp Move Moving-to-a-specific-line
You can know lists of categories and topics by command-line completion feature. See also :help cmdline-completion