Perhaps you should try some spelling variations:
decrease quality » increase quality (Expand search), disease quality (Expand search)
python codigo » python coding (Expand search), python code (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease and (Expand search)
on decrease » on decreased (Expand search), of decrease (Expand search), or decrease (Expand search)
codigo java » codigo ana (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease on decrease quality program ) OR ( python codigo java python programming ))~.