Perhaps you should try some spelling variations:
"sound generation random" » "sound generator random", "sound generated random", "sound generalized random", "second generation random", "based generation random"
"und generative random" » "und generate random", "und generalized random", "und generalised random", "und degenerative random", "und generation random", "und generatoren random"
"sound generation radar" » "second generation radar", "based generation radar", "sound generation raman", "sound generation radio", "sound generation rotary"
"sound generating random" » "sound generated random", "und generation random", "sound creating 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 ("sound generation random"))) OR ((("sound generating random") OR ("und generative random")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"sound generation radar\") or (\"sound generation random\"))) or (((\"sound generating random\") OR (\"und generative random\"))))".
• Removing quotes may allow a broader search: (((( sound generation radar ) or ( sound generation random ))) or ((( sound generating random ) OR ( und generative random )))).
• Adding a wildcard symbol may retrieve word variants: (((("sound generation radar") or ("sound generation random"))) or ((("sound generating random") OR ("und generative random"))))*.