Perhaps you should try some spelling variations:
"dung van phan snippets" » "duong van phan snippets", "dung va phan snippets", "dang van phan snippets", "dung van phong snippets", "dung van thanh snippets", "dung luan phan snippets", "dung van phan slippers"
"dung vbugs code snippets" » "dung vbugs code slippers", "dung vbungs code snippets", "dung vbugss code snippets"
"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 vbugs code snippets") or ("dung van phan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugs code snippets") OR ("dung van phan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugs code snippets ) or ( dung van phan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugs code snippets") or ("dung van phan snippets"))) or ("locating bug code snippets"))*.