COVID-19(38) Research(13) knowledge(12) COVID-19 pandemic(11) approach(11) identify(11) drug(9) machine(9) Knowledge graph(9) machine learning(9) Spread(8) Algorithm(8) applied(8) addition(8) evaluated(7) drug candidate(7) information(7) Candidates(7) predicted(6) virus(6) text mining(6) complex(6) candidate drug(6) Drug repurposing(6) Vaccine(6) clinical trials(6) natural language processing(6) feasible(5) while(5) Accuracy(5)