Perhaps you should try some spelling variations:
"using computational and computation program" » "and computational and computation program" (Expand search), "using computational and computational program" (Expand search), "using computational and computational programs" (Expand search), "using computational and compensation program" (Expand search), "using computational fluid computation program" (Expand search), "using computational of computation program" (Expand search)
"advanced modulation _ computing program" » "advanced calculation _ computing program" (Expand search), "advanced oxidation _ computing program" (Expand search), "advanced modulation _ consulting program" (Expand search), "advanced modulation _ computer program" (Expand search), "advanced modulation _ computador 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: "((\"using computational and computation program\") OR (\"advanced modulation _ computing program\"))~".
• Removing quotes may allow a broader search: (( using computational and computation program ) OR ( advanced modulation _ computing program ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational and computation program") OR ("advanced modulation _ computing program"))*.