Perhaps you should try some spelling variations:
"advanced computation and obstructive program" » "advanced computations and obstructive program" (Expand search), "advanced computational and obstructive program" (Expand search), "advance computational and obstructive program" (Expand search), "advanced computation and destructive program" (Expand search), "advanced computation and constructing program" (Expand search), "advanced computation and obstructive arterial" (Expand search), "advanced computation of obstructive program" (Expand search), "advanced computation in obstructive program" (Expand search), "advanced computation apnea obstructive program" (Expand search)
"by computational and computing program" » "by computational fluid computing program" (Expand search), "by computational and consulting program" (Expand search), "by computational and computer program" (Expand search), "by computational and computador program" (Expand search), "_ computational and computing program" (Expand search), "and computational and computing program" (Expand search), "by computational grid computing program" (Expand search), "by computational fog computing program" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"advanced computation and obstructive program\") OR (\"by computational and computing program\"))~".
• Removing quotes may allow a broader search: (( advanced computation and obstructive program ) OR ( by computational and computing program ))~.
• Adding a wildcard symbol may retrieve word variants: (("advanced computation and obstructive program") OR ("by computational and computing program"))*.