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