Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dung tin cong snippets" » "dong tin cong snippets", "luong tin cong snippets", "dung tren cong snippets", "dung tien cong snippets", "dung tan cong snippets", "dung thien cong 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 cong 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 cong snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tin cong snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tin cong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.