Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets"
"doi anh son snippets" » "doi hanh son snippets", "doi canh son snippets", "doi sanh son snippets", "doi anh dong snippets", "doi tinh son snippets"
"locating bug code snippets" » "locating bug core 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 code snippets\") OR (\"doi anh son snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java code snippets ) OR ( doi anh son snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") OR ("doi anh son snippets"))) OR ("locating bug code snippets"))*.