Perhaps you should try some spelling variations:
"trinh thuc dan snippets" » "trinh tu dan snippets", "trinh thi dan snippets", "trinh thuc hanh snippets", "trinh hoc dan snippets", "trinh thuc vat snippets", "trinh thuc dan 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"

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