Perhaps you should try some spelling variations:
"decrease site infection" » "decrease acute infection" (Expand Search), "decrease hiv infection" (Expand Search), "decrease iav infection" (Expand Search), "decrease rice infection" (Expand Search), "decreased since infection" (Expand Search)
"decrease site selection" » "decrease rice selection" (Expand Search), "decreased since selection" (Expand Search)
"decrease i infection" » "decrease 2 infection" (Expand Search), "decrease _ infection" (Expand Search), "decreases _ infection" (Expand Search), "decreased _ infection" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("decrease site infection") OR ("decrease site selection"))) OR ("decrease i infection"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"decrease site infection\") OR (\"decrease site selection\"))) OR (\"decrease i infection\"))".
• Removing quotes may allow a broader search: (((( decrease site infection ) OR ( decrease site selection ))) OR ( decrease i infection )).
• Adding a wildcard symbol may retrieve word variants: (((("decrease site infection") OR ("decrease site selection"))) OR ("decrease i infection"))*.