Perhaps you should try some spelling variations:
"trinh tran hung snippets" » "trinh trang hung snippets", "trinh toan hung snippets", "trinh tren hung snippets", "trinh tran hong snippets", "trinh tran quang snippets", "trinh tran hoang snippets", "trinh tran hung 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 ("trinh tran hung snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ung code snippets") OR ("trinh tran hung snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung ung code snippets ) or ( trinh tran hung snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ung code snippets") or ("trinh tran hung snippets"))) or ("locating bug code snippets"))*.