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

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• Adding a wildcard symbol may retrieve word variants: (((("2016 west bengal legislation assembly election") or ("2017 text bengal legislation assembly election"))) or ("2016 west bengal legislation assembly selection"))*.