django searching

hello all,
i am trying to have an advanced search..
i have college list where there are many tables in college like
college.name, collge.city college.state etc.

so i have taken two strings from the user like Q1 and Q2.
now i want to show all the colleges which have Q1 string in name and
Q2 string in city..
basically i want to add "and" & "or" statement in this statement :

college_list = College.objects.filter(name__icontains=Q1)

so i want to add one another filter like (city__icontains=Q2)

anyone please tell me..
thanks in advance

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