Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu le » hieu ve, hieu he, hieu ly
thuc ha » thu ha, thuc va, thuc hanh
ha manh » ho manh, ha anh, ha thanh
manh ba » manh cua, danh bat, manh hai
ca viet » va viet, hoa viet, san viet
co viet » so viet, o viet, hoc viet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu le nam thuc ha manh ba ((ca viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu le nam thuc ha manh ba ((ca viet) OR (co viet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu le nam thuc ha manh ba ((ca viet) or (co viet))*.