Perhaps you should try some spelling variations:
"dung toi trinh snippets" » "dung thi trinh snippets", "dung doi trinh snippets", "dung toi tinh snippets", "dung thoi trinh snippets", "dung tai trinh snippets", "dung toi trinh slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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 toi trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung toi trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.