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