Perhaps you should try some spelling variations:
"dung chung code snippets" » "dung cong code snippets", "dung trung code snippets", "truong chung code snippets", "dung chung co snippets", "dung chung code slippers"
"dung nen code snippets" » "dung nhan code snippets", "dung ngan code snippets", "dung tren code snippets", "dung nen co snippets", "dung nen cong snippets", "dung nen code slippers"
"locating bug code 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 nen code snippets") or ("dung chung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung nen code snippets") OR ("dung chung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung nen code snippets") or ("dung chung code snippets"))) or ("locating bug code snippets"))*.