Perhaps you should try some spelling variations:
sprague studies » spruce studies, sprachen studien, suffrage studies
der filologia » de filologia, di filologia, e filologia
studies der » studies ds, studies d, studies dn
filologia a » filologia e, filologica e, filosofia da
rats » rate, rat

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 rays) sprague studies der filologia a literature.
• Adding a wildcard symbol may retrieve word variants: (rats or rays) sprague studies der filologia a literature*.