Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"tri lieu data snippets" » "tri lieu dao snippets", "tri bieu dat snippets", "tri lieu da snippets", "tai lieu data snippets", "thi lien 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java core snippets") or ("tri lieu data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("tri lieu data snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( tri lieu data snippets ))) or ( locating bug code snippets ))*.