Perhaps you should try some spelling variations:
"date visualization python computer program" » "date visualization method computer program" (Expand search), "date visualization methods computer program" (Expand search), "date visualization tool computer program" (Expand search), "data visualization python computer program" (Expand search), "data visualizations python computer program" (Expand search), "based visualization python computer program" (Expand search), "date visualization python computer programa" (Expand search)
"advanced calculation in scheduling problem" » "advanced glycation in scheduling problem" (Expand search), "advanced calculation of scheduling problem" (Expand search), "advanced calculation _ scheduling problem" (Expand search), "advanced calculations and scheduling problem" (Expand search), "advanced calculation gain scheduling problem" (Expand search), "advanced calculation and scheduling problem" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"advanced calculation in scheduling problem\") OR (\"date visualization python computer program\"))~".
• Removing quotes may allow a broader search: (( advanced calculation in scheduling problem ) OR ( date visualization python computer program ))~.
• Adding a wildcard symbol may retrieve word variants: (("advanced calculation in scheduling problem") OR ("date visualization python computer program"))*.