Perhaps you should try some spelling variations:
"ingenieria electrica y fluidomecanica." » "ingenieria mecanica y fluidomecanica.", "energia electrica y fluidomecanica.", "ingenieria electrica en fluidomecanica.", "ingenieria electrica de fluidomecanica.", "ingenieria electricas de fluidomecanica."
"ingenieria genetica fluidos mecanica." » "ingenieria mecanica fluidos mecanica.", "ingenieria general fluidos mecanica.", "ingenieria genetica luis mecanica.", "ingenieria genetica fluid mechanics."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ingenieria genetica fluidos mecanica.") or ("ingenieria electrica y fluidomecanica."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("ingenieria genetica fluidos mecanica.") OR ("ingenieria electrica y fluidomecanica.")).
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• Adding a wildcard symbol may retrieve word variants: (("ingenieria genetica fluidos mecanica.") or ("ingenieria electrica y fluidomecanica."))*.