From EBSCO:
CINAHL indexes the top nursing and allied health literature available including nursing journals and publications from the National League for Nursing and the American Nurses Association.
For full-text nursing and allied health journals, CINAHL Ultimate is the largest full-text companion to the CINAHL index.
CINAHL includes rigorous curation and indexing of open access (OA) journals, which has resulted in a growing collection of 1,389 active global OA journals. Once validated and certified for inclusion, these OA journals are treated with high-quality subject indexing and sophisticated, precise/accurate full-text linking.
The following links explain how to use Boolean operators, field codes, wildcards, and truncation. Additionally, these pages cover how to use proximity searches, including phrases in searches, and single versus plural searching.