Perhaps you should try some spelling variations:
"dung dung code snippets" » "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung code slippers"
"lieu va code snippets" » "hieu va code snippets", "dieu va code snippets", "lieu va code slippers"
"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: (((("lieu va code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lieu va code snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lieu va code snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lieu va code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.