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