Perhaps you should try some spelling variations:
"dap nhung cau snippets" » "vap nhung cau snippets", "va nhung cau snippets", "dap ung cau snippets", "dap chung cu snippets", "dap nhung bai snippets", "dap 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: (((("dap 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: (((("dap nhung cau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dap nhung cau snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dap nhung cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.