Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets"
"van luong low snippets" » "van duong low snippets", "van cuong low snippets", "nang luong low snippets", "van duong loi snippets", "van huong loi snippets", "van luong do 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"van luong low snippets\") OR (\"using java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( van luong low snippets ) OR ( using java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van luong low snippets") OR ("using java java snippets"))) OR ("locating bug code snippets"))*.