Perhaps you should try some spelling variations:
"phi hanh trinh slippers" » "phi canh tranh slippers", "phi hanh chinh slippers", "phi khanh trinh slippers", "thi hanh trinh slippers", "chi hanh trinh slippers", "phi hanh trinh slippery", "phi hanh 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: (((("phi hanh 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: (((("phi hanh trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phi hanh trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phi hanh trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.