Perhaps you should try some spelling variations:
"computer class associations" » "computer classes association", "computer les associations", "computer calms associations", "computer its associations", "computer glass associations", "computer classes associations", "computer chess associations"
"computers class association" » "computers its association", "computers classes association", "computer glass association", "computers case association"
"computers chess association" » "computers press association", "computers cross association", "computers chemists association", "computer chess association", "computers access association", "computers ch association"

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: (((("computers class association") OR ("computers chess association"))) OR ("computer class associations")).
• Removing quotes may allow a broader search: (((( computers class association ) or ( computers chess association ))) or ( computer class associations )).
• Adding a wildcard symbol may retrieve word variants: (((("computers class association") or ("computers chess association"))) or ("computer class associations"))*.