Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
khong cong » thong cong, khong cang, chong cong
cong sang » cong san, cong lang, cong vang
sang than » cang thang, dang thanh, sang tao
than cau » toan cau, phan cau, than cap
hoc thi » hoc thai, hoc tai, hoc chi

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

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