Perhaps you should try some spelling variations:
"dung soat chat snippets" » "dung dat chat snippets", "dung sai chat snippets", "dung san chat snippets", "dung hoat chat snippets", "dung sat chat snippets", "dung suat chat snippets"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug core snippets"
"locating bug 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 soat chat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung soat chat snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung soat chat snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung soat chat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.