Perhaps you should try some spelling variations:
"trinh thanh phan snippets" » "tinh thanh phan snippets", "trinh han phan snippets", "trinh toan phan snippets", "trinh thanh pho snippets", "trinh thanh san snippets", "trinh thanh toan snippets", "trinh thanh phan slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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: (((("trinh thanh phan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh thanh phan snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh thanh phan snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh thanh phan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.