Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
die filologia » di filologia, de filologia, e filologia
filologia et » filologia e, filologica e, filosofia e
oral phase » normal phase, local phase, coal phase
study die » study deep, study d, study direct
dual » deal

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((oral phase) OR (dual phase)) study die filologia et litterature".
• Adding a wildcard symbol may retrieve word variants: ((oral phase) OR (dual phase)) study die filologia et litterature*.