Perhaps you should try some spelling variations:
"cong dung code snippets" » "cuong dung code snippets", "cong dong code snippets", "cong luong code snippets", "cong dung cong snippets", "cong dung co snippets", "cong dung de snippets"
"dung ung java slippers" » "dung trung java slippers", "dung quang java slippers", "dung chung java slippers", "dung using java slippers", "dung ngu java slippers", "dung ung va slippers", "dung ung java slippery", "dung ung java grippers"
"locating bug code snippets" » "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: (((("cong dung code snippets") or ("dung ung java slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong dung code snippets") OR ("dung ung java slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong dung code snippets ) or ( dung ung java slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dung code snippets") or ("dung ung java slippers"))) or ("locating bug code snippets"))*.