Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"rong danh cau snippets" » "rong doanh cau snippets", "trong danh cau snippets", "cong danh cau snippets", "rong danh dau snippets", "rong danh ca snippets", "rong danh hau 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 ("rong danh 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 ("rong danh cau snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( rong danh cau snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("rong danh cau snippets"))) or ("locating bug code snippets"))*.