Perhaps you should try some spelling variations:
"trung dai trong snippets" » "truong dai trong snippets", "truong dao trong snippets", "trung tam trong snippets", "trung tai trong snippets", "trung bai trong snippets", "trung dai tuong snippets", "trung dai trong slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trung dai trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trung dai trong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung dai trong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung dai trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.