Perhaps you should try some spelling variations:
"hanh dan trinh snippets" » "hanh dan tinh snippets", "hanh van trinh snippets", "hanh hanh trinh snippets", "thanh dan trinh snippets", "hanh san trinh snippets", "canh dan trinh snippets", "hanh dan trinh 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: (((("hanh dan trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh dan trinh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh dan trinh snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh dan trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.