Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
hoc xanh » hoc anh, hoc hanh, hoc danh
cua tong » cua cong, cua dong, cua nong
dan than » dan chan, ban than, van than
cho hoc » co hoc, khoa hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho hoc xanh - thanh trung cua tong cong ((dan than) or (dan ca)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho hoc xanh - thanh trung cua tong cong ((dan than) OR (dan ca)) cau.
• Adding a wildcard symbol may retrieve word variants: cho hoc xanh - thanh trung cua tong cong ((dan than) or (dan ca)) cau*.