Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"toc viet tran snippets" » "toc viet trang snippets", "toc viet tuan snippets", "toc viet trung snippets", "hoc viet tran snippets", "thuc viet tran snippets", "ngoc viet tran snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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 ("toc viet tran snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("toc viet tran snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( toc viet tran snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("toc viet tran snippets"))) or ("locating bug code slippers"))*.