Perhaps you should try some spelling variations:
"complementaridade constrained problemass" » "complementaridade contained problemass" (Expand Search), "complementaridade constrained problemas" (Expand Search), "complementaridade constrained problems" (Expand Search), "complementaridade constrained problemes" (Expand Search), "complementaridade constrained problemasss" (Expand Search)
"complementarity constraints problema" » "complementar constraints problema" (Expand Search), "complementarity constraints problemas" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("complementaridade constrained problemass") OR ("complementarity constraints problema"))~.
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• Removing quotes may allow a broader search: (( complementaridade constrained problemass ) OR ( complementarity constraints problema )).
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