The webapp provides for each item the link on ECB's website.
Speeches for : Mario Draghi where "valuation" appeared
2018-12-15 : Europe and the euro 20 years on2018-09-18 : The Benefits of European Supervision
2016-01-21 : Introductory statement to the press conference (with Q&A)
2014-09-25 : Keynote speech at the Euro Conference - Lithuania