The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "efficiency" appeared
2017-10-18 : Structural reforms in the euro area2017-05-29 : Hearing of the Committee on Economic and Monetary Affairs of the European Parliament
2015-03-26 : Introductory statement at the Italian Parliament
2015-03-18 : Speech at the inauguration of the New ECB Premises
2014-02-12 : Financial Integration and Banking Union