Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java snippets"
"van luong duc snippets" » "van duong duc snippets", "van cuong duc snippets", "nang luong duc snippets", "van luong cuoc snippets", "van luong dich snippets"

You may be able to get more results by adjusting your search query.

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