Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java snippets"
"viet van van snippets" » "viet nam van snippets", "viet anh van snippets", "viet ha van snippets", "viet van ban snippets", "viet tan van snippets", "viet san van 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 van van 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 van van snippets\"))) OR (\"locating bug core snippets\"))*".
• Removing quotes may allow a broader search: (((( using java java snippets ) OR ( viet van van snippets ))) OR ( locating bug core snippets ))*.