Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets", "using java java slippers"
"danh viet trac snippets" » "anh viet trac snippets", "ninh viet trac snippets", "nang viet trac snippets", "danh viet tran snippets", "danh viet trang snippets", "danh viet thuc snippets", "danh viet trac slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("danh viet trac snippets") or ("using java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh viet trac snippets") OR ("using java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh viet trac snippets ) or ( using java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh viet trac snippets") or ("using java java snippets"))) or ("locating bug code snippets"))*.