Start your search in a general engineering database, then try a few more databases from the lists below that suit your topic.
Broaden your perspective -- try databases with wider subject coverage:
Compendex (Engineering Index/Engineering Village) indexes all of the society publishers listed below. However, you can find the very newest content first on the publisher's sites, before it gets indexed for Compendex, and if you need historical information, you can find content published before 1970 here.
Consider an alternative perspective on your topic: