Perhaps you should try some spelling variations:
"dung thuoc code snippets" » "dung thuoc co snippets", "dung thuoc cong snippets", "dung thuoc code slippers"
"ung dung code snippets" » "ung dung cong snippets", "ung dung co snippets", "ung dung de snippets", "ung dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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