Perhaps you should try some spelling variations:
"dang anh trong snippets" » "dang anh thuong snippets", "dang dinh trong snippets", "dang lang trong snippets", "dang hanh trong snippets", "dang manh trong snippets", "dong anh trong snippets", "dang anh trong 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: (((("dang anh trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang anh trong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang anh trong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang anh trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.