Perhaps you should try some spelling variations:
"dung cac trung snippets" » "dung cac truong snippets", "dung dac trung snippets", "dung bac trung snippets", "luong cac trung snippets", "dung cho trung snippets", "dung tai trung snippets", "dung cac trung slippers"
"dung java java snippets" » "dung va java snippets", "dung java 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 cac trung snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cac trung snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cac trung snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.