Perhaps you should try some spelling variations:
"vi trung lon snippets" » "vi trung long snippets", "vi truong lon snippets", "vi trung son snippets", "va trung lon snippets", "viet trung lon snippets", "vien trung lon snippets"
"using sat java snippets" » "using data java snippets", "using a java snippets", "using raw java snippets", "using sat va 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 lon snippets\") OR (\"using sat java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( vi trung lon snippets ) OR ( using sat java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vi trung lon snippets") OR ("using sat java snippets"))) OR ("locating bug code snippets"))*.