Perhaps you should try some spelling variations:
"trieu tinh code snippets" » "trieu tinh co snippets", "thieu tinh code snippets", "trien tinh code snippets", "tieu tinh code snippets", "trieu tinh 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"
"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: (((("trieu tinh 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: (((("trieu tinh code snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trieu tinh code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.