Perhaps you should try some spelling variations:
"van thi trinh slippers" » "van tho trinh slippers", "van thi thanh slippers", "van thi minh slippers", "van tai trinh slippers", "dan thi trinh slippers", "van thu trinh slippers", "van thi trinh slippery", "van thi 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 thi 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 thi trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thi trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thi trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.