http://library.mh.org.au/ >> popular databases >> select institution >> Medline. Ovid Medline page will open
EG literature on guidelines for hand hygiene in nursing becomes hand hygiene + guidelines + nursing
You will search each of these separately, then combine.
Select the lines you want using the check boxes to the left of screen.
Combine with the AND button below your search history.
This finds material containing all your concepts.
This should be mostly relevant.