Perhaps you should try some spelling variations:
"dung xuan trinh snippets" » "dung qua trinh snippets", "dung xuan dinh snippets", "dung xuan kinh snippets", "duong xuan trinh snippets", "dung quan trinh snippets", "dong xuan trinh snippets", "dung xuan trinh slippers"
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets", "dung luan 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: (((("dung luan code snippets") or ("dung xuan trinh snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung luan code snippets") OR ("dung xuan trinh snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luan code snippets ) or ( dung xuan trinh snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luan code snippets") or ("dung xuan trinh snippets"))) or ("locating bug code snippets"))*.