Perhaps you should try some spelling variations:
"hanh quoc code snippets" » "khanh quoc code snippets", "han quoc code snippets", "anh quoc code snippets", "hanh quoc co snippets", "hanh quoc cong snippets", "hanh quoc code slippers"
"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", "dung cac 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: (((("hanh quoc code snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh quoc code snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("hanh quoc code snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.