Perhaps you should try some spelling variations:
"computers class association" » "computers its association", "computers classes association", "computers case association", "computer classes association"
"computers chess association" » "computers press association", "computers cross association", "computers chemists association", "computer chess association", "computers access association", "computers ch association"
"computer glass association" » "computer grass association", "computer class associations", "computer gas association", "computer flash association", "computer classes 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 glass association")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"computers class association\") OR (\"computers chess association\"))) or (\"computer glass association\"))".
• Removing quotes may allow a broader search: (((( computers class association ) OR ( computers chess association ))) or ( computer glass association )).
• Adding a wildcard symbol may retrieve word variants: (((("computers class association") OR ("computers chess association"))) or ("computer glass association"))*.