Perhaps you should try some spelling variations:
"complementar contained problemaasa" » "complementar obtained problemaasa" (Expand Search), "complementar contained problemas" (Expand Search), "complementar contained problematica" (Expand Search), "complementar contained problemaaasa" (Expand Search), "complementar contained problemasaasa" (Expand Search)
"complementarity constraints problem" » "complementaridade constraints problem" (Expand Search), "complementarity constraints problema" (Expand Search), "complementarity constraints problemas" (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: (("complementar contained problemaasa") OR ("complementarity constraints problem"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementar contained problemaasa\") OR (\"complementarity constraints problem\"))".
• Removing quotes may allow a broader search: (( complementar contained problemaasa ) OR ( complementarity constraints problem )).
• Adding a wildcard symbol may retrieve word variants: (("complementar contained problemaasa") OR ("complementarity constraints problem"))*.