Perhaps you should try some spelling variations:
"van quynh trinh slippers" » "van huynh trinh slippers", "van quy trinh slippers", "van quynh trang slippers", "manh quynh trinh slippers", "tran quynh trinh slippers", "van quynh trinh slippery", "van quynh 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 quynh 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 quynh trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van quynh trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van quynh trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.