Perhaps you should try some spelling variations:
oxford handbooks » oxford handbook, word handbooks, oxford guidebooks
"Oxford handbooks online / Oxford handbooks online" » "Oxford sandboxes online / Oxford sandboxes online", "Oxford books online / Oxford books online", "Oxford handbuch online / Oxford handbuch online"
"Oxford handouts online / Oxford handouts online" » "Oxford handbuch online / Oxford handbuch online"
"oxford redbooks online / oxford redbooks online" » "oxford guidebooks online / oxford guidebooks online", "oxford books online / oxford books online", "oxford netbook online / oxford netbook online"

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 handbooks online / Oxford handbooks online") OR ("Oxford handouts online / Oxford handouts online"))) OR ("oxford redbooks online / oxford redbooks online")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Oxford handbooks online / Oxford handbooks online\") OR (\"Oxford handouts online / Oxford handouts online\"))) or (\"oxford redbooks online / oxford redbooks online\"))".
• Removing quotes may allow a broader search: (((( Oxford handbooks online / Oxford handbooks online ) OR ( Oxford handouts online / Oxford handouts online ))) or ( oxford redbooks online / oxford redbooks online )).
• Adding a wildcard symbol may retrieve word variants: (((("Oxford handbooks online / Oxford handbooks online") OR ("Oxford handouts online / Oxford handouts online"))) or ("oxford redbooks online / oxford redbooks online"))*.