Perhaps you should try some spelling variations:
"trinh doanh tai." » "trinh doan tai." (Expand Search), "kinh doanh tai." (Expand Search), "trinh thanh tai." (Expand Search), "trinh doanh van." (Expand Search)
"trinh danh gian." » "trinh dung gian." (Expand Search), "trinh dan gian." (Expand Search), "trinh danh gia." (Expand Search), "trinh danh giac." (Expand Search)
"trinh danh tac." » "trinh dung tac." (Expand Search), "trinh danh lam." (Expand Search), "trinh canh tan." (Expand Search), "trinh danh muc." (Expand Search)
"trinh dao tac." » "trinh do tac." (Expand Search), "trinh dao tao." (Expand Search), "trinh dao tuc." (Expand Search), "trinh dao tan." (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("trinh danh gian.") OR ((((("trinh danh tac.") OR ("trinh dao tac."))) OR ("trinh doanh tai."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"trinh danh gian.\") OR (((((\"trinh danh tac.\") OR (\"trinh dao tac.\"))) OR (\"trinh doanh tai.\"))))".
• Removing quotes may allow a broader search: (( trinh danh gian. ) OR ((((( trinh danh tac. ) OR ( trinh dao tac. ))) OR ( trinh doanh tai. )))).
• Adding a wildcard symbol may retrieve word variants: (("trinh danh gian.") OR ((((("trinh danh tac.") OR ("trinh dao tac."))) OR ("trinh doanh tai."))))*.