Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung tin ca snippets" » "dong tin ca snippets", "luong tin ca snippets", "dung tren ca snippets", "dung tinh ca snippets", "dung tin cac snippets", "dung tan ca 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 tin ca snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tin ca snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tin ca snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tin ca snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.