Perhaps you should try some spelling variations:
"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"
"trinh va thep snippets" » "trinh van thep snippets", "trinh vat thep snippets", "trinh ve thep snippets", "trinh va tiep snippets", "trinh va theo snippets", "trinh va thiet snippets", "trinh va thep slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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