Perhaps you should try some spelling variations:
nhat hanh » nhat ban, nhat minh
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
hieu he » hieu ve, hiem he, hieu le
va hanh » van hanh, va thanh, va danh
ky lang » ky dang, ky tang, tay lang
hai cua » thai cua, dai cua, hoi cua
te sach » toc sach
he nam » ha nam, nghe nam

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 lang) or (ky nang)) hoa hoc. hieu he nam thuc ((nhat hanh) or (va hanh)) hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) hoa hoc. hieu he nam thuc ((nhat hanh) OR (va hanh)) hai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky nang)) hoa hoc. hieu he nam thuc ((nhat hanh) or (va hanh)) hai cua viet*.