Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"sach toan cau snippets" » "hach toan cau snippets", "sach tranh cau snippets", "hoach toan cau snippets", "sach toan cao snippets", "sach toan ban snippets", "sach toan tap snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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: (((("using java code snippets") or ("sach toan cau snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("sach toan cau snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( sach toan cau snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("sach toan cau snippets"))) or ("locating bug code snippets"))*.