Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
cua phuong » cuu phuong, cuc phuong, luan phuong
duoc lieu » du lieu
doc lieu » doc hieu, du lieu, so lieu
tinh cua » trinh cua, sinh cua, tinh chat
tap toan » tap doan, tap quan, bai toan

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: ((doc lieu) OR (duoc lieu)) tinh - nhanh tinh cua phuong cong ((tan tran) OR (tap toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ((doc lieu) or (duoc lieu)) tinh - nhanh tinh cua phuong cong ((tan tran) or (tap toan)) cau*.