Search CINAHL using your chosen terms, along with Boolean operators AND, OR, and NOT (or the operators in the dropdown menus); the truncation symbol gets variations such as other word endings and plural forms. For example, putting in child* would get back child, child's, children, children's, childhood, and so on.
Also, terms connected with AND, OR, and NOT work much better than typing in an entire sentence.
A search like: (infection control or asepsis) and surger* and child*
should work much better than using a sentence such as: Do certain procedures protect children from post-surgical infections better than others? because the software tries to find the whole sentence if you type one in.
Using quotation marks: Want to find a phrase instead of individual words? Put the phrase "in quotes."
For example: "exercise compliance" OR "exercise adherence."
Be aware that this will limit your search.