Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
tac toan » tap toan, tam toan, hach toan
tap doan » tap quan

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 tranh cua thong cong ((tac toan) or (tap doan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - hanh tranh cua thong cong ((tac toan) OR (tap doan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - hanh tranh cua thong cong ((tac toan) or (tap doan)) cau*.