Perhaps you should try some spelling variations:
"dung san dung snippets" » "dong san dung snippets", "dung sai dung snippets", "dung luan dung snippets", "dung van dung snippets", "dung dan dung snippets", "dung lan dung snippets", "dung san dung slippers"
"dung ung java snippets" » "dung trung java snippets", "dung quang java snippets", "dung chung java snippets", "dung using java snippets", "dung ngu java snippets", "dung ung va snippets", "dung ung java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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