Perhaps you should try some spelling variations:
"dung luyen ngu snippets" » "dung huyen ngu snippets", "dung tuyen ngu snippets", "dung nguyen ngu snippets", "dung truyen ngu snippets", "dung chuyen ngu snippets", "dung luyen nghe snippets", "dung luyen ngu slippers"
"using ibm code snippets" » "using rbf code snippets", "using lbm code snippets", "using ibm code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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 luyen ngu 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 luyen ngu snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using ibm code snippets ) or ( dung luyen ngu snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using ibm code snippets") or ("dung luyen ngu snippets"))) or ("locating bug code snippets"))*.