Perhaps you should try some spelling variations:
"dung trong code snippets" » "dung trong cong snippets", "dung trong co snippets", "dung trong che snippets", "dung trong code slippers"
"dong doc trinh snippets" » "dong doc tinh snippets", "dong doi trinh snippets", "dong hoc trinh snippets", "dong duoc trinh snippets", "dong do trinh snippets", "dong doc trinh 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: (((("dong doc trinh snippets") or ("dung trong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong doc trinh snippets") OR ("dung trong code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dong doc trinh snippets") or ("dung trong code snippets"))) or ("locating bug code snippets"))*.