Perhaps you should try some spelling variations:
"advanced simulation and computer program" » "advanced calculation and computer program" (Expand search), "advanced simulation _ computer program" (Expand search)
"advanced modulation guided computer program" » "advanced calculation guided computer program" (Expand search), "advanced oxidation guided computer program" (Expand search), "advanced education guided computer program" (Expand search), "advanced simulation guided computer program" (Expand search), "advanced mediation guided computer program" (Expand search), "advanced modulation aided computer program" (Expand search), "advanced modulation guioes computer program" (Expand search), "advanced modulation fixed computer program" (Expand search)

You may be able to get more results by adjusting your search query.

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