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

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 problemassa"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problema\") OR (\"complementarity constraints problemassa\"))*".
• Removing quotes may allow a broader search: (( complementaridade constrained problema ) OR ( complementarity constraints problemassa ))*.