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