Perhaps you should try some spelling variations:
"doanh cao code snippets" » "doanh co code snippets", "doanh bao code snippets", "doanh cho code snippets", "doanh cao cong snippets", "doanh cao de snippets", "doanh cfd code snippets", "doanh cao code slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung 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: (((("doanh cao code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doanh cao code snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("doanh cao code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.