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