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