Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"da lieu data snippets" » "da lieu dao snippets", "da bieu dat snippets", "da lieu da snippets", "du lieu data snippets", "da dieu data snippets", "vat lieu data snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: "((((\"using java core snippets\") OR (\"da lieu data snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java core snippets ) OR ( da lieu data snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") OR ("da lieu data snippets"))) OR ("locating bug code snippets"))*.