Perhaps you should try some spelling variations:
"dung thuong het snippets" » "hang thuong het snippets", "dung trong het snippets", "cong thuong het snippets", "dung thuong thiet snippets", "dung thuong viet snippets", "dung thuong hieu snippets", "dung thuong het 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 java java snippets") or ("dung thuong het snippets"))) or ("locating bug code snippets"))~.
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• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung thuong het snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung thuong het snippets"))) or ("locating bug code snippets"))*.