Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"trinh toan doc snippets" » "tinh toan doc snippets", "thanh toan doc snippets", "trinh han doc snippets", "trinh toan hoc snippets", "trinh than doc snippets", "trinh toan do 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 toan doc 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 toan doc snippets") OR ("dung cac code snippets"))) OR ("locating bugs code snippets")).
• Removing quotes may allow a broader search: (((( trinh toan doc snippets ) or ( dung cac code snippets ))) or ( locating bugs code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan doc snippets") or ("dung cac code snippets"))) or ("locating bugs code snippets"))*.