Perhaps you should try some spelling variations:
imagem processing » image processing (Expand search), images processing (Expand search), imaging processing (Expand search)
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
depressed imagem » depressed aged (Expand search), impressoes imagem (Expand search), impresso imagem (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
decrease not » decrease of (Expand search), decrease akt (Expand search), decrease at (Expand search)
not decrease » to decrease (Expand search), not increase (Expand search), and decrease (Expand search)

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: (( decrease during depressed imagem processing ) OR ( decrease NOT decrease NOT decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease during depressed imagem processing ) OR ( decrease not decrease NOT decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease during depressed imagem processing ) OR ( decrease not decrease NOT decrease ))*.