Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trong » hanh trang, anh trong, hinh trong
trong khoa » truong khoa, tuong khoa, trung khoa
tang dong » tang duong, nang dong, wang dong
lang dong » lang trong, lao dong, cong dong
thanh ban » thanh van, thanh bac, thanh bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu xanh - hanh trong khoa ((tang dong) OR (lang dong)) bang ((thanh ban) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - hanh trong khoa ((tang dong) OR (lang dong)) bang ((thanh ban) OR (thanh san)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - hanh trong khoa ((tang dong) OR (lang dong)) bang ((thanh ban) or (thanh san))".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh trong khoa ((tang dong) OR (lang dong)) bang ((thanh ban) or (thanh san))*.