Perhaps you should try some spelling variations:
"van dung cong snippets" » "van dung code snippets", "van dung trong snippets", "van dong cong snippets", "xay dung cong snippets", "tin dung cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("van dung cong snippets") OR ("using java java snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"van dung cong snippets\") OR (\"using java java snippets\"))) OR (\"locating bug core snippets\"))*".
• Removing quotes may allow a broader search: (((( van dung cong snippets ) OR ( using java java snippets ))) OR ( locating bug core snippets ))*.