Perhaps you should try some spelling variations:
"complementaridade constrained problems" » "complementaridade contained problems" (Expand Search), "complementaridade constrained problemas" (Expand Search), "complementaridade constrained problema" (Expand Search), "complementaridade constrained problemass" (Expand Search)
"complementarity constraints problem" » "complementar constraints problem" (Expand Search), "complementarity 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 problems") OR ("complementarity constraints problem"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problems\") OR (\"complementarity constraints problem\"))".
• Removing quotes may allow a broader search: (( complementaridade constrained problems ) OR ( complementarity constraints problem )).
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