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