This pair of verbs ( suchen, suchen nach) reflects the specific / unspecific distinction in German. There's no pair of verbs like this neither in English nor in Spanish. Specific : suchen: you know exactly what you're looking for -> example -> I'm looking for a (certain) book. -> " Ich suchen ein ( bestimmtes) Buch" Ich suche Mich -> this means you are sure there must be some milk and you just can't find it Unspecific: suchen nach : this would you rather take, if you're looking something indefinite -> example -> I'm looking for books -> Ich suche Bücher Ich suche nach Milch -> you are not sure if there's milk but you are looking for some

Para mi no hay diferencia. Aqui "nach" indica la dirección (como "hacia").