Perhaps you should try some spelling variations:
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"dung duoc dai snippets" » "dong duoc dai snippets", "cung duoc dai snippets", "dung quoc dai snippets", "dung duc dai snippets", "dung luoc dai snippets", "dung duoc dan snippets", "dung duoc dai 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 duoc dai 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 duoc dai snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using ibm code snippets ) or ( dung duoc dai snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung duoc dai snippets"))) or ("locating bug code snippets"))*.