Perhaps you should try some spelling variations:
thuyet mach » thuyet xac, thuyet cac, thuyet anh
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
trinh xuat » trinh luat, trinh xuan, trich xuat
xuat trong » xuat truong, xuat thong, luat trong
van than » van thanh, van thang, van tuan
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: hoc thuyet mach - hanh trinh xuat trong cong ((van than) or (ban than)) man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet mach - hanh trinh xuat trong cong ((van than) OR (ban than)) man.
• Adding a wildcard symbol may retrieve word variants: hoc thuyet mach - hanh trinh xuat trong cong ((van than) or (ban than)) man*.