Perhaps you should try some spelling variations:
inmigracion extranjera » inversion extranjera (Expand Search)
percepciones las » percepciones de (Expand Search), percepciones y (Expand Search), percepcion la (Expand Search)
la inmigracion » la integracion (Expand Search)
las actitudes » y actitudes (Expand Search), la actitud (Expand Search)
hacia la » hacia una (Expand Search)
barometro » parametro (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: barometro : percepciones las actitudes hacia la inmigracion extranjera~.
• Adding a wildcard symbol may retrieve word variants: barometro : percepciones las actitudes hacia la inmigracion extranjera*.