Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"long toan hoc snippets" » "long toan code snippets", "bong toan hoc snippets", "cong toan hoc snippets", "long doan hoc snippets", "long toan khoa snippets", "long van hoc snippets", "long hoa hoc snippets"
"dung java java snippets" » "dung va java 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: (((("dung java java snippets") or ("long toan hoc snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("long toan hoc snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( long toan hoc snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("long toan hoc snippets"))) or ("locating bug core snippets"))*.