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