Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"sach hanh cac snippets" » "sach danh cac snippets", "sach han cac snippets", "sac hanh cac snippets", "sach hang cac snippets", "sach hanh cat snippets", "sach nhanh cay 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 hanh cac 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 hanh cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( sach hanh cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("sach hanh cac snippets"))) or ("locating bug code snippets"))*.