Perhaps you should try some spelling variations:
complementos alimentarios » suplementos alimenticios, suplemento alimentario, complementacion alimentaria
suplementos alimentacion » suplementos alimenticios, suplemento alimentario, humanos alimentacion
"suplementos dieteticos" » "suplemento dietario", "suplementos alimenticios"
suplemento alimenticio » suplementos alimenticios, suplemento alimentario

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("suplementos dieteticos") or ("((((suplementos alimentacion) or (complementos alimentarios))) or (suplemento alimenticio))"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("suplementos dieteticos") OR ("((((suplementos alimentacion) or (complementos alimentarios))) or (suplemento alimenticio))")).
• Removing quotes may allow a broader search: (( suplementos dieteticos ) or ( ((((suplementos alimentacion) or (complementos alimentarios))) or (suplemento alimenticio)) )).
• Adding a wildcard symbol may retrieve word variants: (("suplementos dieteticos") or ("((((suplementos alimentacion) or (complementos alimentarios))) or (suplemento alimenticio))"))*.

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