Perhaps you should try some spelling variations:
"fragen allgemeine" » "aufgaben allgemeine", "grundlagen allgemeine"
"basen allgemeine" » "gasen allgemeines", "deren allgemeine", "leben allgemeine"
"feld allgemeine" » "felder allgemeine", "umfeld allgemeines", "falle allgemeine"
"ugld allgemeine" » "und allgemeine", "gold allgemeines", "und allgemeines"

Try widening your search to All Fields.

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: (((("feld allgemeine") OR ("ugld allgemeine"))) OR ((("basen allgemeine") OR ("fragen allgemeine")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"feld allgemeine\") or (\"ugld allgemeine\"))) or (((\"basen allgemeine\") OR (\"fragen allgemeine\"))))".
• Removing quotes may allow a broader search: (((( feld allgemeine ) or ( ugld allgemeine ))) or ((( basen allgemeine ) OR ( fragen allgemeine )))).
• Adding a wildcard symbol may retrieve word variants: (((("feld allgemeine") or ("ugld allgemeine"))) or ((("basen allgemeine") OR ("fragen allgemeine"))))*.