Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"viet luong cac snippets" » "viet huong cac snippets", "viet cuong cac snippets", "viet muong cac snippets", "viet luong cuoc snippets", "viet luong va snippets", "viet luong tai 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 ("viet luong 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 ("viet luong cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( viet luong cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("viet luong cac snippets"))) or ("locating bug code snippets"))*.