Perhaps you should try some spelling variations:
"lan trinh hoa snippets" » "lap trinh hoa snippets", "dan trinh hoa snippets", "lan tranh hoa snippets", "lan trinh do snippets", "lan trinh han snippets"
"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 trinh hoa snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan trinh hoa snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan trinh hoa snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan trinh hoa snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.