Perhaps you should try some spelling variations:
"tran trinh van snippets" » "trang trinh van snippets", "tra trinh van snippets", "thanh trinh van snippets", "tran trinh han snippets", "tran trinh quan snippets", "tran trinh toan snippets", "tran trinh van slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung java java snippets") or ("tran trinh van snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tran trinh van snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tran trinh van snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tran trinh van snippets"))) or ("locating bug code snippets"))*.