Perhaps you should try some spelling variations:
"using computational complexity computer program" » "and computational complexity computer program" (Expand search), "using computational complexity complex program" (Expand search), "using computational complexity computacao program" (Expand search), "using computational complexity competences program" (Expand search)
"code complication of coding program" » "more complications of coding program" (Expand search), "acute complication of coding program" (Expand search), "cause complication of coding program" (Expand search), "code complications of coding program" (Expand search), "code complications in coding program" (Expand search), "code complications and coding program" (Expand search), "code complication of cloning program" (Expand search), "code complication of loading program" (Expand search), "code complication of cooling programs" (Expand search), "code complication non coding program" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"code complication of coding program\") OR (\"using computational complexity computer program\"))~".
• Removing quotes may allow a broader search: (( code complication of coding program ) OR ( using computational complexity computer program ))~.
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