Research

Diligent inquiry or examination in seeking facts or principles; laborious or continued search after truth; as, researches of human wisdom.

To search or examine with continued care; to seek diligently.

a search for knowledge; "their pottery deserves more research than it has received"

inquire into; "the students had to research the history of the Second World War for their history project"; "He searched for information on his relatives on the web"; "Scientists are exploring the nature of consciousness"

systematic investigation to establish facts