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