Perhaps you should try some spelling variations:
lang hoa » hang hoa, lang ha, nang hoa
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu he » hieu ve, hiem he, hieu le
hanh ve » hanh vi, hanh va, hanh kem
su viet » so viet
su hien » su kien, su tien, thu hien
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
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: tu san ky lang hoa hoi. hieu he nam thuc vat hanh ve ((su viet) or (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang hoa hoi. hieu he nam thuc vat hanh ve ((su viet) OR (su hien)).
• Adding a wildcard symbol may retrieve word variants: tu san ky lang hoa hoi. hieu he nam thuc vat hanh ve ((su viet) or (su hien))*.