Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
thuat mach » thuat sach, thuat tach, thuyet mach
hanh hinh » hanh chinh, hanh tinh, hanh dinh
nhan tong » nhan trong, nhan thong, nhan tuong
hinh cua » chinh cua, sinh cua, tinh cua
cua nhan » ca nhan, cua ngan, cua nha
ban than » ban thanh, van thanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: khoi thuat mach - hanh hinh cua nhan tong ((ban than) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoi thuat mach - hanh hinh cua nhan tong ((ban than) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: khoi thuat mach - hanh hinh cua nhan tong ((ban than) or (tinh toan)) cau*.