Perhaps you should try some spelling variations:
"advanced computational and computer program" » "and computational and computer program" (Expand search), "based computational and computer program" (Expand search), "advanced computational fluid computer program" (Expand search), "advanced computational _ computer program" (Expand search)
"advanced oxidation method coding program" » "advanced oxidation methods coding program" (Expand search), "advanced validation method coding program" (Expand search), "advanced foundation method coding program" (Expand search), "advanced oxidation method cloning program" (Expand search), "advanced oxidation method loading program" (Expand search), "advanced oxidation method cooling programs" (Expand search), "advanced oxidation method cooling program" (Expand search), "advanced oxidation method fnding program" (Expand search), "advanced oxidation method according program" (Expand search)

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