Perhaps you should try some spelling variations:
"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"
"dung chi tran snippets" » "dung cho tran snippets", "dung thi tran snippets", "dung chien tran snippets", "dung chi toan snippets", "dung thi trang snippets", "dung chi tran 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 cau code snippets") or ("dung chi tran snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cau code snippets") OR ("dung chi tran snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cau code snippets ) or ( dung chi tran snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cau code snippets") or ("dung chi tran snippets"))) or ("locating bug code snippets"))*.