Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christians upon » christians among, christians from, christians being
10th century » 18th century, 20th century, 19th century
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2021 10th » 2022 10th, 2021 13th, 2021 16th