Perhaps you should try some spelling variations:
"complementar constrained problemaasasasa" » "complementar contained problemaasasasa" (Expand Search), "complementar constrained problemaaasasasa" (Expand Search), "complementar constrained problemasaasasasa" (Expand Search)
"complementaridade constraints problem" » "complementaridade constraints problema" (Expand Search), "complementaridade 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: (("complementar constrained problemaasasasa") OR ("complementaridade constraints problem"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementar constrained problemaasasasa\") OR (\"complementaridade constraints problem\"))".
• Removing quotes may allow a broader search: (( complementar constrained problemaasasasa ) OR ( complementaridade constraints problem )).
• Adding a wildcard symbol may retrieve word variants: (("complementar constrained problemaasasasa") OR ("complementaridade constraints problem"))*.