Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"trinh van con snippets" » "trinh han con snippets", "trinh quan con snippets", "trinh toan con snippets", "trinh van cong snippets", "trinh van bon snippets", "trinh van co 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 van con 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 van con snippets") OR ("dung cac code snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( trinh van con snippets ) or ( dung cac code snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh van con snippets") or ("dung cac code snippets"))) or ("locating bugs code snippets"))*.