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