The search will match on the phrase that you enter. Since the title does not contain "...Robert<space>Drivers..." or "...Robert<space>License..." or "...Robert<space> Expires...", it does not match. The AND search is searching for those two words (not in the middle of a word, but distinct words) in the title/text.
To search within a word like that, you could use an Advanced search like
(Item) matches wildcard Robert
and (Item) matches wildcard Drivers
or if Tools | Options | Search | Match anywhere in word by default is unchecked
(Item) matches wildcard *Robert*
and (Item) matches wildcard *Drivers*
|