据为己有: take forcible possession of; appropriate to oneself (what rightfully belongs to another); have all to oneself; keep ... for one's own; make sth. one's own; make sth. one's personal capital
贪天之功据为己有: appropriate to oneself the meritorious services of others; arrogate to oneself the credit of others; credit other people's achievements to oneself; shamelessly take all the credit for [to]