Perhaps you should try some spelling variations:
nhung trung » chuong trung, dung trung, nhung dung
hien nhanh » hien hanh, thien thanh, tien thanh
trung tuan » trung thanh, tran tuan, truong thanh
trung dai » truong dai, truong dao, trung cap
dai toan » bai toan, dan toan, dai tan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien nhanh - hanh ((trung tuan) or (trung tam)) nhung trung dai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - hanh ((trung tuan) OR (trung tam)) nhung trung dai toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - hanh ((trung tuan) or (trung tam)) nhung trung dai toan cao*.