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