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