Perhaps you should try some spelling variations:
"turkey economic conditions 1981-1989" » "turkey economic conditions 1945-1989" (Expand Search), "turkey economic conditions 1918-1989" (Expand Search), "turkey economic conditions 1979-1989" (Expand Search)
"turkey economic conditions 1982-1989" » "turkey economic conditions 1945-1989" (Expand Search), "turkey economic conditions 1918-1989" (Expand Search), "turkey economic conditions 1979-1989" (Expand Search)
"turkey economic conditions 1960-1989" » "turkey economic conditions 1945-1989" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("turkey economic conditions 1981-1989") OR ((("turkey economic conditions 1982-1989") OR ("turkey economic conditions 1960-1989"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"turkey economic conditions 1981-1989\") OR (((\"turkey economic conditions 1982-1989\") OR (\"turkey economic conditions 1960-1989\"))))".
• Removing quotes may allow a broader search: (( turkey economic conditions 1981-1989 ) OR ((( turkey economic conditions 1982-1989 ) OR ( turkey economic conditions 1960-1989 )))).
• Adding a wildcard symbol may retrieve word variants: (("turkey economic conditions 1981-1989") OR ((("turkey economic conditions 1982-1989") OR ("turkey economic conditions 1960-1989"))))*.