Perhaps you should try some spelling variations:
"18 summer olympic boycott" » "1 summer olympic boycott", "10 summer olympic boycott", "15 summer olympic boycott", "18 summer olympic boycotts"
"1988 summer olympics boycott" » "1988 summer olympics boycotts"

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: (("1988 summer olympics boycott") OR ("18 summer olympic boycott")).
• Removing quotes may allow a broader search: (( 1988 summer olympics boycott ) or ( 18 summer olympic boycott )).
• Adding a wildcard symbol may retrieve word variants: (("1988 summer olympics boycott") or ("18 summer olympic boycott"))*.