Perhaps you should try some spelling variations:
nang thao » nang tao, rang thao, nang thanh
thao khoa » thai khoa, toan khoa, pham khoa
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hieu he » hieu ve, hiem he, hieu le
va danh » va dinh, va dan, va hanh
su cac » tu cac, su cao, su can
he nam » ha nam, nghe nam
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky nang thao khoa. hieu he nam thuc ((van hanh) or (va danh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky nang thao khoa. hieu he nam thuc ((van hanh) OR (va danh)) di cua viet.
• Adding a wildcard symbol may retrieve word variants: su cac ky nang thao khoa. hieu he nam thuc ((van hanh) or (va danh)) di cua viet*.