Perhaps you should try some spelling variations:
"trinh co thieu snippets" » "trinh do thieu snippets", "trinh cong thieu snippets", "trinh hoa thieu snippets", "trinh co hieu snippets", "trinh co phieu snippets", "trinh toc thieu snippets", "trinh co thieu 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 co thieu 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 co thieu snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh co thieu snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh co thieu snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.