Perhaps you should try some spelling variations:
"fuentes laborales, alejandro." » "fuentes orales, alejandro." (Expand Search), "fuentes parrales, alejandro." (Expand Search), "jueces laborales, alejandro." (Expand Search)
"fuerzas laborales, alejandro." » "fuerza laboral, alejandro." (Expand Search), "materias laborales, alejandro." (Expand Search), "normas laborales, alejandro." (Expand Search)