Perhaps you should try some spelling variations:
"1997 world trotting championships" » "1997 world fighting championship", "1997 world winning championships", "1997 world treating championships", "1997 world protecting championships", "1997 world promoting championships", "1992 world trotting championships", "1993 world trotting championships", "1995 world trotting championships"
"1994 world trotting championships" » "1994 world fighting championship", "1994 world winning championships", "1994 world treating championships", "1994 world protecting championships", "1994 world promoting championships", "1992 world trotting championships", "1993 world trotting championships", "1995 world trotting championships"
"1997 world trusting championships" » "1997 world trusting relationships", "1997 world fighting championship", "1997 world winning championships", "1997 world treating championships", "1997 world testing championships", "1997 world adjusting championships", "1992 world trusting championships", "1993 world trusting championships", "1995 world trusting championships"

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: (((("1997 world trotting championships") OR ("1997 world trusting championships"))) OR ("1994 world trotting championships")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"1997 world trotting championships\") OR (\"1997 world trusting championships\"))) or (\"1994 world trotting championships\"))".
• Removing quotes may allow a broader search: (((( 1997 world trotting championships ) OR ( 1997 world trusting championships ))) or ( 1994 world trotting championships )).
• Adding a wildcard symbol may retrieve word variants: (((("1997 world trotting championships") OR ("1997 world trusting championships"))) or ("1994 world trotting championships"))*.