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