Perhaps you should try some spelling variations:
"trinh pham trong snippets" » "trinh phan trong snippets", "trinh phap trong snippets", "trinh cham trong snippets", "trinh pham thuong snippets", "trinh pham cong snippets", "trinh nam trong snippets", "trinh pham trong 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 pham trong 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 pham trong snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh pham trong snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh pham trong snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.