Perhaps you should try some spelling variations:
"van thinh chat snippets" » "van tinh chat snippets", "van trinh chat snippets", "van thinh phat snippets", "van thanh chat snippets", "van chinh chat snippets", "van minh chat 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: (((("dung java java snippets") or ("van thinh chat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("van thinh chat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( van thinh chat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("van thinh chat snippets"))) or ("locating bug code snippets"))*.