Perhaps you should try some spelling variations:
"phan cac doanh snippets" » "phan cac dan snippets", "phan cac dang snippets", "phan van doanh snippets", "nhan cach doanh snippets", "phan dau doanh snippets", "phan lap doanh snippets", "phan cac doanh slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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: (((("phan cac doanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan cac doanh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("phan cac doanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.