Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"viet dung code snippets" » "viet hung code snippets", "viet huong code snippets", "viet trung code snippets", "viet dung cong snippets", "viet dung co snippets", "viet dung de snippets"
"locating bug core snippets" » "locating bug code snippets"

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 java snippets") OR ("viet dung code snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java java snippets\") OR (\"viet dung code snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using java java snippets ) OR ( viet dung code snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") OR ("viet dung code snippets"))) OR ("locating bug core snippets"))*.