Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"dong hoc 12 snippets" » "dong co 12 snippets", "dong luc 12 snippets", "dong hoc 10 snippets", "dong hoc 11 snippets", "dong hoc 2012 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: (((("dong hoc 12 snippets") OR ("python using java snippets"))) OR ("locating bug core snippets"))~.
• Removing quotes may allow a broader search: (((( dong hoc 12 snippets ) or ( python using java snippets ))) or ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dong hoc 12 snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.