1) Crouch in front of a Berry brush
2) Target the brush and search for the "Search for berries" to appear
3) When it appear repetitively hit the middle mouse button to search for berries and never stop (make sure "Search for berries" still appears)
Notice when the character is about to say the search result, the repetitively hit the middle mouse button will search again the brush without any waiting time !
That ways you can find like 4-5 apples/berries etc in a single search
Screenshot attached, in a single berrie search I have found 3 berries