Perhaps you should try some spelling variations:
"vi trung long snippets" » "vi truong long snippets", "vi trung uong snippets", "vi trong long snippets", "va trung long snippets", "viet trung long snippets", "vien trung long snippets"
"using data java snippets" » "using java java snippets", "using sat java snippets", "missing 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.

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