Perhaps you should try some spelling variations:
"ingreso a2 curso." » "ingreso al curso.", "ingreso en curso.", "ingreso y curso.", "ingreso en2 curso.", "regreso a2 curso.", "ingreso el curso.", "ingreso un curso.", "ingreso ael curso.", "ingreso aun curso.", "ingreso aen curso."
"ingresos 2 curso." » "ingresos y curso.", "ingresos o curso.", "ingresos en curso.", "ingresos el curso.", "ingresos un curso."
"ingreso a curso." » "ingreso en curso.", "regreso a curso.", "ingreso al curso.", "ingreso 1 curso.", "ingreso 3 curso."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("ingreso a2 curso.") OR ("ingreso a curso."))) or ("ingresos 2 curso."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ingreso a2 curso.") OR ("ingreso a curso."))) OR ("ingresos 2 curso.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ingreso a2 curso.\") OR (\"ingreso a curso.\"))) or (\"ingresos 2 curso.\"))".
• Removing quotes may allow a broader search: (((( ingreso a2 curso. ) OR ( ingreso a curso. ))) or ( ingresos 2 curso. )).
• Adding a wildcard symbol may retrieve word variants: (((("ingreso a2 curso.") OR ("ingreso a curso."))) or ("ingresos 2 curso."))*.