Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
thuat mach » thuat sach, thuat tach, thuyet mach
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hang nong » thang long, han tong
sinh cua » manh cua, dinh cuu, sinh va
cua hang » cua dang, cua nhung, cua cong
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 sinh cua hang nong ((ban than) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoi thuat mach - hanh sinh cua hang nong ((ban than) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: khoi thuat mach - hanh sinh cua hang nong ((ban than) or (tinh toan)) cau*.