Nexis Uni Example:
climate change and us national security
Since Nexis Uni is fulltext, many times using the - and - connector will retrieve too many results. Bringing the words closer together helps to locate more relevant articles.
Use w/# =
"climate change" w/5 "us national security" = w/5 means there can only be 5 words between climate change and us national security
You can also use:
w/s = same sentence
w/p = same paragraph