Perhaps you should try some spelling variations:
"trinh luan phep snippets" » "trinh luat phep snippets", "trinh quan phep snippets", "trinh han phep snippets", "trinh luan phan snippets", "trinh luat phap snippets", "trinh luan che snippets", "trinh luan phep 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: (((("trinh luan phep snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh luan phep snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh luan phep snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh luan phep snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.