Perhaps you should try some spelling variations:
"15 summer olympic" » "1 summer olympic", "15 summen olympic", "18 summer olympic"
"17 summer olympic" » "1 summer olympic", "18 summer olympic", "19 summer olympic"
"10 summer olympics" » "10 summery olympics", "1 summer olympics", "30 summer olympics"

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: (((("15 summer olympic") OR ("17 summer olympic"))) OR ("10 summer olympics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"15 summer olympic\") OR (\"17 summer olympic\"))) or (\"10 summer olympics\"))".
• Removing quotes may allow a broader search: (((( 15 summer olympic ) OR ( 17 summer olympic ))) or ( 10 summer olympics )).
• Adding a wildcard symbol may retrieve word variants: (((("15 summer olympic") OR ("17 summer olympic"))) or ("10 summer olympics"))*.