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