Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"trinh 11 model snippets" » "trinh ky model snippets", "trinh do model snippets", "trinh tu model snippets", "trinh 1 model snippets", "trinh a model snippets", "trinh _ model snippets"
"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"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh 11 model snippets") or ("dung cac code snippets"))) or ("locating bugs code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh 11 model snippets") OR ("dung cac code snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( trinh 11 model snippets ) or ( dung cac code snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh 11 model snippets") or ("dung cac code snippets"))) or ("locating bugs code snippets"))*.