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 code computer programs" » "advanced calculation code computer programs" (Expand search), "advanced oxidation code computer programs" (Expand search), "advanced modulation codes computer programs" (Expand search), "advanced modulation model computer programs" (Expand search), "advanced modulation doped computer programs" (Expand search), "advanced modulation node computer programs" (Expand search), "advanced modulation one computer programs" (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 code computer programs\"))~".
• Removing quotes may allow a broader search: (( advanced simulation and computer program ) OR ( advanced modulation code computer programs ))~.
• Adding a wildcard symbol may retrieve word variants: (("advanced simulation and computer program") OR ("advanced modulation code computer programs"))*.