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