Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"dung van luan snippets" » "duong van luan snippets", "dung va luan snippets", "dang van luan snippets", "dung van quan snippets", "dung van tuan snippets", "dung von luan 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 code snippets") OR ("dung van luan snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java code snippets\") OR (\"dung van luan snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using java code snippets ) OR ( dung van luan snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") OR ("dung van luan snippets"))) OR ("locating bug core snippets"))*.