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