Perhaps you should try some spelling variations:
"dung tranh trong snippets" » "dung tran trong snippets", "dung trinh trong snippets", "dung anh trong snippets", "dung thanh trong snippets", "dong tranh trong snippets", "dung trong trong snippets", "dung tranh trong 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 tranh trong 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 tranh trong snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tranh trong snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tranh trong snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.