Perhaps you should try some spelling variations:
"trinh cac code snippets" » "trinh cau code snippets", "trinh chat code snippets", "trinh chao code snippets", "trinh cac cong snippets", "trinh cac co snippets", "trinh cac che snippets", "trinh cac code slippers"
"dung cho tu snippets" » "dung choi tu snippets", "dung chon tu snippets", "dung cho cu snippets", "dung cho tu 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 cac code snippets") or ("dung cho tu snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac code snippets") OR ("dung cho tu snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cac code snippets ) or ( dung cho tu snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cac code snippets") or ("dung cho tu snippets"))) or ("locating bug code snippets"))*.