Perhaps you should try some spelling variations:
"1989 iaaf world op" » "1989 imf world op" (Expand Search), "1989 iaaf world we" (Expand Search)
"1989 iaaf world _" » "1989 imf world _" (Expand Search)
"1989 imf wordt op" » "1989 imf world op" (Expand Search), "1989 imf wordt de" (Expand Search), "1989 imf wordt er" (Expand Search)
"1989 iaaf wereld op" » "1989 iaaf wereld _" (Expand Search)
"1989 iaaf wereld en" » "1989 iaaf wereld _" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("1989 iaaf world op") OR ("1989 imf wordt op"))) OR ("1989 iaaf world _"))) OR ((("1989 iaaf wereld op") OR ((("1989 iaaf wereld en") OR ("1989 iaaf wereld van"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"1989 iaaf world op\") OR (\"1989 imf wordt op\"))) OR (\"1989 iaaf world _\"))) OR (((\"1989 iaaf wereld op\") OR (((\"1989 iaaf wereld en\") OR (\"1989 iaaf wereld van\"))))))".
• Removing quotes may allow a broader search: (((((( 1989 iaaf world op ) OR ( 1989 imf wordt op ))) OR ( 1989 iaaf world _ ))) OR ((( 1989 iaaf wereld op ) OR ((( 1989 iaaf wereld en ) OR ( 1989 iaaf wereld van )))))).
• Adding a wildcard symbol may retrieve word variants: (((((("1989 iaaf world op") OR ("1989 imf wordt op"))) OR ("1989 iaaf world _"))) OR ((("1989 iaaf wereld op") OR ((("1989 iaaf wereld en") OR ("1989 iaaf wereld van"))))))*.