Reversing the order can affect searches too: motorcycle candles vs. candles motorcycle.
This is by design. See the excellent book Google Hacks: 100 Industrial-Strength Tips and Tricks. It explains many of the quirks of Google, such as word ordering, and how repeating a word can change the search results. This book also has information on programming with the Google XML API. (Unfortunately, the use of the API feels pretty restricted, requiring registration with Google and there is a limit on the number of searches per day you can execute.)
Did you know about 'phonebook:'? I didn't, until I read this book. It's an undocumented Google feature. Try it: "google for phonebook:hillary clinton ny"