Perhaps you should try some spelling variations:
"dung trung code snippets" » "dung trong code snippets", "quang trung code snippets", "truong trung code snippets", "dung trung co snippets", "dung trung code slippers"
"dung dan trinh snippets" » "dung dan tinh snippets", "dung van trinh snippets", "dung hanh trinh snippets", "dung dat trinh snippets", "dung san trinh snippets", "tung dan trinh snippets", "dung dan 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 dan trinh snippets") or ("dung trung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dan trinh snippets") OR ("dung trung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dan trinh snippets ) or ( dung trung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dan trinh snippets") or ("dung trung code snippets"))) or ("locating bug code snippets"))*.