Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
khoa hoi » khoan hoi, khoa hoc, khoa doi
nam thuc » nam thuoc, am thuc, nam thu
hoa hoi » hoa hoc, hoa doi, hoc hoi
hieu le » hieu ve, hieu he, hieu ly
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
hai cua » thai cua, dai cua, hoi cua
te sach » toc sach
le nam » ly nam, he nam, le na

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

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