Perhaps you should try some spelling variations:
"dung cau quan snippets" » "dung chau quan snippets", "dung cu quan snippets", "dung cac quan snippets", "dung cau qua snippets", "dung cao quan snippets", "dung ca quan snippets", "dung cau quan slippers"
"dung cau code snippets" » "dung chau code snippets", "dung cu code snippets", "dung cac code snippets", "dung cau cong snippets", "dung cau de snippets", "dung cfd code snippets", "dung cau 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 cau quan snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung cau quan snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))*.