Perhaps you should try some spelling variations:
"ingenieria electrica en fluidomecanica." » "ingenieria mecanica en fluidomecanica.", "energia electrica en fluidomecanica.", "ingenieria electrica y fluidomecanica.", "ingenieria electrica en biomecanica."
"energia electricas de fluidomecanica." » "energia electrica de fluidomecanica.", "energia electricos de fluidomecanica.", "energia lectrica de fluidomecanica.", "energia electricas y fluidomecanica."

Try widening your search to All Fields.

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