Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets"
"trac doi tinh snippets" » "trao doi tinh snippets", "truan doi tinh snippets", "thay doi tinh snippets", "trac doi trinh snippets", "trac hoi tinh snippets", "trac don tinh snippets"
"locating bug core snippets" » "locating bug code snippets"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("trac doi tinh snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( trac doi tinh snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("trac doi tinh snippets"))) or ("locating bug core snippets"))*.