To be confident you have found all the relevant material on your topic, do a cited reference search in GoogleScholar. This is best done when you have completed your search in the databases and have identified the key papers. Simply put each title into GoogleScholar and see who has cited that paper. This brings you right up to date and ensures there are no significant gaps in your results.
Make sure you set up alerts so that you know when new papers are published in your field.
Staff and Postgraduate students
In some cases it may make sense for you to travel to the British Library or use another library which does have what you need.
Librarians cannot devise search strategies for students. We can offer advice, training and feedback on:
For members of staff who need assistance devising searches for a review, we are happy to meet to discuss your project and offer advice and training. We don't currently offer a literature searching or information specialist service, or have a chargeable service that you can cost in to your project. At some times of year we may have more capacity than others. Please email email@example.com to discuss your needs.
Faculty Librarians are often invited to deliver workshops, talks, webinars and demonstrations as part of your taught programme to help you to develop the knowledge and skills required to searching the literature.
There is also a Library & Information Skills programme on offer, which includes workshops and webinars on Effective searching.