Perhaps you should try some spelling variations:
"using rbf code snippets" » "using ibm code snippets", "using raw code snippets", "using lbm code snippets", "using rbf code slippers"
"dung viet trac snippets" » "nang viet trac snippets", "cong viet trac snippets", "mang viet trac snippets", "dung viet tran snippets", "dung viet trang snippets", "dung viet thuc snippets", "dung viet trac 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 rbf code snippets") or ("dung viet trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using rbf code snippets") OR ("dung viet trac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using rbf code snippets ) or ( dung viet trac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using rbf code snippets") or ("dung viet trac snippets"))) or ("locating bug code snippets"))*.