Perhaps you should try some spelling variations:
"2016 test bengal legislation assembly election" » "2007 test bengal legislation assembly election", "2017 text bengal legislation assembly election"
"2016 test bengal legislation assembly selection" » "2007 test bengal legislation assembly selection", "2017 text bengal legislation assembly selection"
"2016 test bengal legislation assembly electron" » "2007 test bengal legislation assembly electron", "2017 text bengal legislation assembly electron", "2016 test bengal legislation assembly electronic"

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• Adding a wildcard symbol may retrieve word variants: (("2016 test bengal legislation assembly election") or ((("2016 test bengal legislation assembly selection") OR ("2016 test bengal legislation assembly electron"))))*.