Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"trinh lua cua snippets" » "trinh luat cua snippets", "trinh luan cua snippets", "trinh cua cua snippets", "trinh qua cua snippets", "trinh xua cua snippets"
"dung nhan code snippets" » "dung luan code snippets", "dung nhan co snippets", "dung nhan con snippets"

Try widening your search to All Fields.

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