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