Perhaps you should try some spelling variations:
copd processes » food processes (Expand search), npd processes (Expand search), coupled processes (Expand search)
decrease root » decrease food (Expand search), decrease soon (Expand search), decreasing root (Expand search)
root diseases » foot diseases (Expand search), goat diseases (Expand search), rust diseases (Expand search)
diseases copd » disease copd (Expand search), diseases covad (Expand search), diseases could (Expand search)
python coding » action coding (Expand search), python code (Expand search)
coding pitons » loading pistons (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease root diseases copd processes ) OR ( python coding pitons python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease root diseases copd processes ) OR ( python coding pitons python programming ))*.