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