Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets", "locating bugs code slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"phap tu code snippets" » "phan tu code snippets", "pham tu code snippets", "phap bug code snippets", "phap tu code slippers"

Try widening your search to All Fields.

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