Perhaps you should try some spelling variations:
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"dung chi tiet snippets" » "dung cho tiet snippets", "dung thi tiet snippets", "dung chien tiet snippets", "dung chi tiet slippers", "dung chi thiet snippets", "dung chi viet snippets", "dung chi tien snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using ibm code snippets") or ("dung chi tiet 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 chi tiet snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using ibm code snippets ) or ( dung chi tiet snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung chi tiet snippets"))) or ("locating bug code snippets"))*.