Perhaps you should try some spelling variations:
"complementaridade constrained problema" » "complementaridade contained problema" (Expand Search), "complementaridade constrained problemas" (Expand Search)
"complementarity constraints problemasasa" » "complementarity constraints problemassasa" (Expand Search), "complementar constraints problemasasa" (Expand Search), "complementarity constraints problemas" (Expand Search), "complementarity constraints problematica" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("complementaridade constrained problema") OR ("complementarity constraints problemasasa"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problema\") OR (\"complementarity constraints problemasasa\"))".
• Removing quotes may allow a broader search: (( complementaridade constrained problema ) OR ( complementarity constraints problemasasa )).
• Adding a wildcard symbol may retrieve word variants: (("complementaridade constrained problema") OR ("complementarity constraints problemasasa"))*.