Perhaps you should try some spelling variations:
"dung cao quan snippets" » "duong cao quan snippets", "dung cho quan snippets", "dung co quan snippets", "dung bao quan snippets", "dung cao xuan snippets", "dung cao 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"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung cao quan snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cao 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 cao quan snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))*.