Perhaps you should try some spelling variations:
"trinh quan hat snippets" » "tinh quang hat snippets", "trinh luat hat snippets", "trinh han hat snippets", "trinh quan ha snippets", "trinh quan hai snippets", "trinh quan sat snippets", "trinh quan hat 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 quan hat 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 quan hat snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh quan hat snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh quan hat snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.