Perhaps you should try some spelling variations:
et litterature » la litterature
art literature » market literature
die filologia » di filologia, de filologia, e filologia
acase study » case study
oral acase » oral case, oral care, oral phase
study die » study deep, study d, study direct

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 acase study die filologia ((et litterature) OR (art literature))".
• Adding a wildcard symbol may retrieve word variants: oral acase study die filologia ((et litterature) OR (art literature))*.