“…The findings are presented in the following Table IX. Portfolio 3 [166,194,219] Big data 3 [43,103,105] Hydrology 2 [39,237] Database 2 [55,198] Sensor 2 [178,212] The table shows that eight research including [37], [93], [179], [208], [210], [222], and [228] are categorized under two problem domains. Meanwhile, machine learning was found to be the most investigated topic using the QA approach as indicated by 26.40% and this was followed by graphics with 24.72%, mathematics with 17.98%, routing with 6.74%, scheduling 6.74%, chemistry computation 5.06%, biology computation 3.37%, security 2.25%, portfolio 1.69%, big data 1.69%, hydrology 1.12%, database 1.12%, and sensors with 1.12%.…”