Perhaps you should try some spelling variations:
sprague studies » spruce studies, sprachen studien, suffrage studies
die filologia » di filologia, de filologia, e filologia
studies die » studie die, studien die, studies does
filologia a » filologia e, filologica e, filosofia da
rats » rate, rays

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (rats OR rat) sprague studies die filologia a literature.
• Adding a wildcard symbol may retrieve word variants: (rats or rat) sprague studies die filologia a literature*.