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