anchor.diff:  * The order of the keywords does not matter. e.g. `Hans Bo` will match `Bo Hans`
   * Only the name is searched.
   * Only full words will be matched e.g. `Han` will not match `Hans`
  -* Persons matching at least one keyword will be returned (i.e. `OR` search). e.g. `Hans` will match `Hans Bo`
  +* Persons matching at least one keyword will be returned (i.e. `OR` search). e.g. `Hans Bo` will return `Hans Gruber`, `Bo Yang`
   ****
   
   Examples:
   
   * `find John` +
  -Returns `John Doe` but not `john`
  +Returns `john` and `John Doe`
   * `find Betsy Tim John` +
  -Returns Any person having names `Betsy`, `Tim`, or `John`
  +Returns any person having names `Betsy`, `Tim`, or `John`
   
   === Deleting a person : `delete`
   
  
positive.code: ****
  * Selects the person and loads the Google search page the person at the specified `INDEX`.
  * The index refers to the index number shown in the most recent listing.
  * The index *must be a positive integer* 1, 2, 3, ...
  ****
  
  Examples:
  
negative.code: Format: `add n/NAME p/PHONE_NUMBER e/EMAIL a/ADDRESS [t/TAG]...`
  
  [TIP]
  A person can have any number of tags (including 0)
  
  Examples:
  
  