Perhaps you should try some spelling variations:
"oxford guidebooks online / oxford guidebooks online" » "oxford guides online / oxford guides online", "oxford guidelines online / oxford guidelines online", "oxford redbooks online / oxford redbooks online"
"oxford quickbooks online / oxford quickbooks online" » "other quickbooks online / other quickbooks online"
"oxford sandboxes online / oxford sandboxes online" » "oxford handbook online / oxford handbook online", "oxford indexes online / oxford indexes online", "oxford sandaunet online / oxford sandaunet online", "oxford sandboxes ein / oxford sandboxes ein"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oxford guidebooks online / oxford guidebooks online") OR ("oxford quickbooks online / oxford quickbooks online"))) OR ("oxford sandboxes online / oxford sandboxes online")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oxford guidebooks online / oxford guidebooks online\") OR (\"oxford quickbooks online / oxford quickbooks online\"))) or (\"oxford sandboxes online / oxford sandboxes online\"))".
• Removing quotes may allow a broader search: (((( oxford guidebooks online / oxford guidebooks online ) OR ( oxford quickbooks online / oxford quickbooks online ))) or ( oxford sandboxes online / oxford sandboxes online )).
• Adding a wildcard symbol may retrieve word variants: (((("oxford guidebooks online / oxford guidebooks online") OR ("oxford quickbooks online / oxford quickbooks online"))) or ("oxford sandboxes online / oxford sandboxes online"))*.