org-agenda-search-view-force-full-words

org-agenda-search-view-force-full-words is a variable defined in `org-agenda.el'.
Its value is

nil

Documentation:
Non-nil means, search words must be matches as complete words.
When nil, they may also match part of a word.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.