Perhaps you should try some spelling variations:
"vu truong cong snippets" » "vu truong code snippets", "vu trong cong snippets", "vu truong dong snippets", "vu truong long snippets", "vu thuong cong snippets", "va truong cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java 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 java snippets") or ("vu truong cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java java snippets") OR ("vu truong cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java java snippets ) or ( vu truong cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") or ("vu truong cong snippets"))) or ("locating bug core snippets"))*.