Yes. You can limit a search to citations with full text or free full text by entering a command in the search box for each search or by selecting Full Text and/or Free Full Text as Filters in My NCBI. Information about Filters is available in My NCBI Help.
To limit a search using the search box, use one of these filters to limit your search:
free full text [sb] or full text [sb]
You can combine these filters with other search terms using the Boolean operator AND.
Example: aids AND free full text [sb]
In the Summary display citations with links to free full text are indicated as "Free article."
Full text articles require a subscription or fee to access. Some providers may require you to register to access free full text.