Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
hieu he » hieu ve, hiem he, hieu le
nang xa » nang x, lang xa, nang ma
he nam » ha nam, nghe nam
su can » su van, su cao, tu can
su sac » su sach, su cac, su xac
di ca » di cau, di cua, doi ca

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

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