Perhaps you should try some spelling variations:
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"dung cao dang snippets" » "duong cao dang snippets", "dung cho dang snippets", "dung co dang snippets", "dung cao dang slippers", "dung cao dan snippets", "dung cao dong snippets", "dung cao nang snippets"
"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 cao dang 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 cao dang snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung cao dang snippets"))) or ("locating bug code snippets"))*.