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