Perhaps you should try some spelling variations:
"tran hanh trinh snippets" » "tran canh tranh snippets", "tran hanh chinh snippets", "tran thanh trinh snippets", "tran manh trinh snippets", "tran anh trinh snippets", "tran hanh 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: (((("tran hanh 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: (((("tran hanh trinh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("tran hanh trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.