Perhaps you should try some spelling variations:
retrieval process » retrieval models (Expand search), removal process (Expand search)
dense retrieval » phase retrieval (Expand search), dna retrieval (Expand search), depth retrieval (Expand search)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (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 _ dense retrieval process ) OR ( decrease their decrease in decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ dense retrieval process ) OR ( decrease their decrease in decrease ))*.