Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
trung khao » trung khanh, truong khac, trung ha
khao dung » kha dung, thao duong, khao huong
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
van than » van thanh, van thang, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (thien thanh)) - thanh trung khao dung cong ((manh toan) or (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien thanh)) - thanh trung khao dung cong ((manh toan) OR (van than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - thanh trung khao dung cong ((manh toan) or (van than)) cao*.