There are different ways to search in PubMed, each with their own benefits.
Example Using MeSH
Example Using Advanced Keyword Search
Example Search
Another great advantage to using Web of Science is the ability to do citation mapping. Click on "Times Cited" (see below) to see article citations that cite the article at hand. The articles will necessarily be more recent and may give you more material on your topic.
Example Search
How to search by topic (3 min)
Example Topic search in SciFinder
Like Web of Science, Google Scholar also has the ability to do citation mapping. Click on "Cited by" (see below) to see article citations that cite the article at hand. The articles will necessarily be more recent and may give you more material on your topic.