Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trinh viet hat snippets" » "ninh viet hat snippets", "trinh vat hat snippets", "trinh viet nhat snippets", "trinh viet ha snippets", "trinh viet dat 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 ("trinh viet hat snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trinh viet hat snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trinh viet hat snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trinh viet hat snippets"))) or ("locating bug code slippers"))*.