Perhaps you should try some spelling variations:
"dung quan trinh snippets" » "dung qua trinh snippets", "dung quan tinh snippets", "dung xuan trinh snippets", "dung quang trinh snippets", "dung luan trinh snippets", "luong quan trinh snippets", "dung quan 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 quan trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung quan trinh snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung quan trinh snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung quan trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.