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