Perhaps you should try some spelling variations:
"18 summer olympics boycott" » "1 summer olympics boycott", "10 summer olympics boycott", "15 summer olympics boycott", "18 summer olympics boycotts"
"1988 summer olympic boycott" » "1988 summer olympic 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 olympic boycott") OR ("18 summer olympics boycott")).
• Removing quotes may allow a broader search: (( 1988 summer olympic boycott ) or ( 18 summer olympics boycott )).
• Adding a wildcard symbol may retrieve word variants: (("1988 summer olympic boycott") or ("18 summer olympics boycott"))*.