This search is not 'smart.' You don't have to give it very much, but what you do give it has to be a match, with the exception of punctuation and dashes.
I recommend picking a few letters from the name that you are certain of. Ideally, include a space between words (if one exists). For example, "r rai" for Summer Rain or "la b" to find Chateau de la Bourdaisiere or "a wag" to find Carolina Wagemans.
Using %, a 'wildcard' character: "hill%beauty" will return Hollyhill varieties with "beauty" later on in the name.