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