Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van danh cau snippets" » "van doanh cau snippets", "van anh cau snippets", "van hanh cau snippets", "van danh dau snippets", "van danh ca snippets", "van danh hau 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: (((("van danh 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: (((("van danh cau snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van danh cau snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van danh cau snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.