Put the operator 'OR' between synonyms
You can also use OR to combine keywords in a search. Using OR means that either keyword can be in the article for it to be retrieved. OR is best used to search for synonyms of a concept. Because any one of these words could show up in your articles, OR broadens your search.
Internet OR Web
Using this search in a periodical index would find all of the citations that mention either Internet or Web.
You can string together words using OR:
Internet OR Web OR online OR digital OR wired