Perhaps you should try some spelling variations:
"dong thuc code snippets" » "dong thuoc code snippets", "duong thuc code snippets", "cong thuc code snippets", "dong thuc co snippets", "dong thuc con snippets", "dong thuc 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: (((("dong thuc 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: (((("dong thuc code snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dong thuc code snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.