Perhaps you should try some spelling variations:
retrieval problems » retrieval process (Expand search), ethical problems (Expand search), extremal problems (Expand search)
dense retrieval » phase retrieval (Expand search), dna retrieval (Expand search), depth retrieval (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search), _ decrease (Expand search)
rate dense » rate defense (Expand search), route dense (Expand search), are dense (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 rate dense retrieval problems ) OR ( decrease the decrease AND decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rate dense retrieval problems ) OR ( decrease the decrease AND decrease ))*.