Perhaps you should try some spelling variations:
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd core snippets", "dung cfd code slippers"
"dung nha java snippets" » "dung nhan java snippets", "dung ha java snippets", "dung khoa java snippets", "dung nha va snippets", "dung ngu java snippets", "dung nha java slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung cfd code snippets") or ("dung nha java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cfd code snippets") OR ("dung nha java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cfd code snippets ) or ( dung nha java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cfd code snippets") or ("dung nha java snippets"))) or ("locating bug code snippets"))*.