Perhaps you should try some spelling variations:
"using java can snippets" » "using data can snippets"
"van luong code snippets" » "van luong cong snippets", "van luong che snippets", "van duong code snippets", "van cuong code snippets", "nang luong code snippets"
"locating bug core snippets" » "locating bug 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 can snippets") OR ("van luong code snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java can snippets\") OR (\"van luong code snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using java can snippets ) OR ( van luong code snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java can snippets") OR ("van luong code snippets"))) OR ("locating bug core snippets"))*.