Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
nhung luong » hung luong, nhung huong, thuong luong
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
theo cuu » theo chu, khao cuu, thao cua
tai toan » bai toan, tap toan, tai tuan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo cuu tinh - hanh trinh cua ((nhung luong) OR (nhung tuong)) tai toan ban~.
• Adding a wildcard symbol may retrieve word variants: theo cuu tinh - hanh trinh cua ((nhung luong) or (nhung tuong)) tai toan ban*.