Perhaps you should try some spelling variations:
decrease variability » decadal variability (Expand search), rate variability (Expand search), scale variability (Expand search)
decrease abortion » decrease migration (Expand search), decreases aortic (Expand search), decrease adhesion (Expand search)
abortion decrease » abortion debate (Expand search), action decreases (Expand search), friction decrease (Expand search)
decrease break » decreases breast (Expand search), decreases areas (Expand search), decrease treg (Expand search)
break decrease » urea decrease (Expand search)
decrease by » decreased by (Expand search), decrease in (Expand search), decrease of (Expand search)
by decrease » by decreased (Expand search), may decrease (Expand search), any decrease (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease break decrease by decrease ) OR ( decrease abortion decrease variability _ ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease break decrease by decrease ) OR ( decrease abortion decrease variability _ ))*.