One of the reasons that it's difficult to incorporate reliable abbreviation searching into these search tools is that there are so many different systems for abbreviating the same journal title. Online abbreviation lists typically only focus on one type of abbreviations, for example, chemistry journal abbreviations.
The most useful tool for decoding journal title abbreviations is the book Periodical Title Abbreviations, which unfortunately has no online version (locations and call number of books).
When in doubt Ask Us. Library staff can look the abbreviation up for you.