Perhaps you should try some spelling variations:
"tran viet thong snippets" » "tran vien thong snippets", "tran viet huong snippets", "tran viet trung snippets", "trien viet thong snippets", "gian viet thong snippets", "san viet thong snippets", "tran viet thong 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: (((("tran viet thong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran viet thong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran viet thong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran viet thong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.