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