Perhaps you should try some spelling variations:
"und generative random" » "und generating random", "und generation random", "und generalized random", "und degenerative random", "und generatoren random"
"sound generation radar" » "second generation radar", "based generation radar", "sound generation raman", "sound generation radio", "sound generation random"
"und generate random" » "und generated random", "und generator random", "und general random", "und gerate random"

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: (("sound generation radar") OR ((("und generative random") OR ("und generate random")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sound generation radar\") or (((\"und generative random\") OR (\"und generate random\"))))".
• Removing quotes may allow a broader search: (( sound generation radar ) or ((( und generative random ) OR ( und generate random )))).
• Adding a wildcard symbol may retrieve word variants: (("sound generation radar") or ((("und generative random") OR ("und generate random"))))*.