Perhaps you should try some spelling variations:
"using computational _ computing program" » "and computational _ computing program" (Expand search), "using computational _ consulting program" (Expand search), "using computational _ computador program" (Expand search), "using computational _ computer programs" (Expand search)
"advanced modulation and computer program" » "advanced calculation and computer program" (Expand search), "advanced oxidation and computer program" (Expand search), "advanced modulation in computer program" (Expand search), "advanced modulation of computer program" (Expand search), "advanced modulation _ computer 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: (("using computational _ computing program") OR ("advanced modulation and computer program"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computational _ computing program\") OR (\"advanced modulation and computer program\"))".
• Removing quotes may allow a broader search: (( using computational _ computing program ) OR ( advanced modulation and computer program )).
• Adding a wildcard symbol may retrieve word variants: (("using computational _ computing program") OR ("advanced modulation and computer program"))*.