Perhaps you should try some spelling variations:
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"dung khau viet snippets" » "dung chau viet snippets", "dung khu viet snippets", "dung khang viet snippets", "dung khoan viet snippets", "dung phap viet snippets", "dung hai viet snippets", "dung khau viet 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 khau viet 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 khau viet snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung khau viet snippets"))) or ("locating bug code snippets"))*.