Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van doan dat slippers" » "van doanh dat slippers", "van toan dat slippers", "van hoan dat slippers", "van dan dat slippers", "van doan dau slippers", "van doanh bat slippers", "van doan dat slippery", "van doan dat grippers"
"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 doan dat slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van doan dat slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van doan dat slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van doan dat slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.