Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"sam doanh cho snippets" » "san doanh cho snippets", "nam danh cho snippets", "van doanh cho snippets", "sam danh cho snippets", "sam doanh co snippets", "sam doanh cao 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 ("sam doanh cho snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("sam doanh cho snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( sam doanh cho snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("sam doanh cho snippets"))) or ("locating bug code snippets"))*.