Perhaps you should try some spelling variations:
"he trong cao snippets" » "he truong cao snippets", "he trong cac snippets", "he trong ca snippets", "he thong cao snippets", "he trung cao snippets", "le trong cao snippets"
"using a java snippets" » "using _ java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("he trong cao snippets") or ("using a java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("he trong cao snippets") OR ("using a java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( he trong cao snippets ) or ( using a java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("he trong cao snippets") or ("using a java snippets"))) or ("locating bug code snippets"))*.