Can't help you on fruit, not my area. ;)
As for the real estate phrases it's a matter of competitiveness.
As I understand it the number of "pages found" by AV is a measure of all pages that contain any, some or all of the words, on competitive phrases AV defaults to searching for the *exact* string.
used autos 5,464
apples pigs 560,830
The easiest way to check if AV considers a phrase competitive is to search with and without the quotation marks, if the number of pages returned are the same then you need to put your price up. ;)