Perhaps you should try some spelling variations:
"duong dang code snippets" » "dung dang code snippets", "duong dan code snippets", "duong dung code snippets", "duong dang cong snippets", "duong dang co snippets", "duong dang de snippets", "duong dang code slippers"
"trinh bug code snippets" » "trinh dung code snippets", "trinh bong code snippets", "trinh bang code snippets", "trinh bug code slippers"
"locating bug code snippets" » "locating bug code slippers"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh bug code snippets") or ("duong dang code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh bug code snippets") OR ("duong dang code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh bug code snippets ) or ( duong dang code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh bug code snippets") or ("duong dang code snippets"))) or ("locating bug code snippets"))*.