Perhaps you should try some spelling variations:
"advanced simulation and computer program" » "advanced modulation and computer program" (Expand search), "advanced calculation and computer program" (Expand search), "advanced simulation _ computer program" (Expand search)
"advanced simulation from communist program" » "advanced modulation from communist program" (Expand search), "advanced calculation from communist program" (Expand search), "advanced simulation from community program" (Expand search), "advanced simulation from community programs" (Expand search), "advanced simulation from community programa" (Expand search), "advanced simulation from communism program" (Expand search), "advanced simulation from communes program" (Expand search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("advanced simulation and computer program") OR ("advanced simulation from communist program"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"advanced simulation and computer program\") OR (\"advanced simulation from communist program\"))".
• Removing quotes may allow a broader search: (( advanced simulation and computer program ) OR ( advanced simulation from communist program )).
• Adding a wildcard symbol may retrieve word variants: (("advanced simulation and computer program") OR ("advanced simulation from communist program"))*.