Less strict search

I notice that partial matches are not shown in search results. For example, if the title contain the word “defensiveness”, search term “defensivene” or “defensi” does not return any result (“defensive” did return a result but probably because the exact word “defensive” in the text body of the article).

Is it possible to add an option for a less strict search? Sometimes our memory betray us and it can eliminate frustration of not remembering the exact word (is it plural or singular, adjective or noun, etc.).