Perhaps you should try some spelling variations:
"van doan trinh slippers" » "van doan tinh slippers", "van dan trinh slippers", "van doan hinh slippers", "van doanh trinh slippers", "van toan trinh slippers", "van hoan trinh slippers", "van doan trinh slippery", "van doan 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: (((("van doan 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: (((("van doan trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van doan trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van doan trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.