Perhaps you should try some spelling variations:
"dan nhung cau snippets" » "ban nhung cau snippets", "dap nhung cau snippets", "san nhung cau snippets", "dan chung cu snippets", "dan nhung bai snippets", "dan nhu cau snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("dan nhung cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan nhung cau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan nhung cau snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan nhung cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.