FreqItemset(items=[u'bbb_1', u'ccc_1', u'ccc_2', u'aaa_1', u'ccc_3'], freq=379)
FreqItemset(items=[u'aaa_1_1', u'ccc_1', u'ccc_2', u'ccc_3'], freq=375)
...

filtered_result = model.freqItemsets()
 .filter(lambda x: x.items[0].startswith('aaa_')).collect()

filtered_result = model.freqItemsets()
     .filter(lambda x: x.items[0].startswith('aaa_'))
     .filter(lambda x: x.items[1].startswith('aaa_'))
     .filter(lambda x: x.items[2].startswith('aaa_'))
     ...
     .collect()

list_1 = [u'bbb_1', u'ccc_1', u'ccc_2', u'aaa_1', u'ccc_3']
list_2 = [u'aaa_1_1', u'ccc_1', u'ccc_2', u'ccc_3']

results_1 = [s for s in list_1 if s.startswith('aaa')]
results_2 = [s for s in list_2 if s.startswith('aaa')]

print(results_1)
print(results_2)