Perhaps you should try some spelling variations:
"van doanh dat snippets" » "toan doanh dat snippets", "van dong dat snippets", "van thanh dat snippets", "van doanh bat snippets", "van doanh dao snippets", "van doanh xuat snippets", "van doanh dat slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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 doanh dat 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 doanh dat snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van doanh dat snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van doanh dat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.