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