Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
2017 germany » 20 germany, 17 germany, 2006 germany
20th century » 18th century
ref history » reef history, brief history, bief history
2.2 20th » 2020 20th, 2023 20th, 2021 20th