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