Perhaps you should try some spelling variations:
"dung trinh tin snippets" » "dung tinh tin snippets", "dong trinh tin snippets", "cong trinh tin snippets", "dung trinh kinh snippets", "dung trinh toan snippets", "dung trinh tu snippets", "dung trinh tin slippers"
"dung trong code snippets" » "dung trong cong snippets", "dung trong co snippets", "dung trong che snippets", "dung trong code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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