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