Perhaps you should try some spelling variations:
wort sprache » worter sprachen, vorwort sprache, portal sprache
world wort » world worth, world sort, world word
1808 two » 18 two, 1.8 two, 1758 two
13.8 two » 1.8 two, 3.8 two, 2.8 two
ii third » iii third, 8 third
7 third » 3 third, 5 third, 6 third

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: ((1808 two) OR (13.8 two)) world wort sprache ((ii third) OR (7 third)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((1808 two) OR (13.8 two)) world wort sprache ((ii third) or (7 third))".
• Adding a wildcard symbol may retrieve word variants: ((1808 two) OR (13.8 two)) world wort sprache ((ii third) or (7 third))*.