Perhaps you should try some spelling variations:
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"dung xuan nhan snippets" » "duong xuan nhan snippets", "dung luan nhan snippets", "dung quan nhan snippets", "dung xuan thanh snippets", "dung xuan toan snippets", "dung van nhan snippets", "dung xuan nhan 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 xuan nhan snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung xuan nhan snippets"))) or ("locating bug code snippets"))*.