Perhaps you should try some spelling variations:
"dung chung code snippets" » "dung cong code snippets", "dung trung code snippets", "truong chung code snippets", "dung chung co snippets", "dung chung code slippers"
"dung thi trinh snippets" » "dung tho trinh snippets", "dung thi thanh snippets", "dung thi minh snippets", "dung tai trinh snippets", "dung tri trinh snippets", "dung chi trinh snippets", "dung thi trinh 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 chung code snippets") or ("dung thi trinh snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung chung code snippets") OR ("dung thi trinh snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung chung code snippets ) or ( dung thi trinh snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung chung code snippets") or ("dung thi trinh snippets"))) or ("locating bug code snippets"))*.