Perhaps you should try some spelling variations:
"he truong lon snippets" » "he truong long snippets", "he truong son snippets", "he truong ton snippets", "he trung lon snippets", "de truong lon snippets", "he trong lon snippets"
"using java java snippets" » "using data 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 truong lon snippets") or ("using java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("he truong lon snippets") OR ("using java java snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( he truong lon snippets ) or ( using java java snippets ))) or ( locating bug code snippets ))*.