Perhaps you should try some spelling variations:
"dung thang nhan snippets" » "hung thang nhan snippets", "cung thang nhan snippets", "dung thuong nhan snippets", "dung thanh nhan snippets", "dung thong nhan snippets", "dung thang thanh snippets", "dung thang nhan slippers"
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm 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: (((("using ibm code snippets") or ("dung thang nhan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using ibm code snippets") OR ("dung thang nhan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using ibm code snippets ) or ( dung thang nhan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung thang nhan snippets"))) or ("locating bug code snippets"))*.