Perhaps you should try some spelling variations:
"acute respiratory setting" » "acute respirator settings", "acute respiratory gating", "acute respiratory weaning"
"acute respiratory testing" » "acute respiratory gating", "acute respiratory training", "acute respiratory patterning"

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: "((\"acute respiratory setting\") OR (\"acute respiratory testing\"))".
• Removing quotes may allow a broader search: (( acute respiratory setting ) OR ( acute respiratory testing )).
• Adding a wildcard symbol may retrieve word variants: (("acute respiratory setting") OR ("acute respiratory testing"))*.