Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
lang hoa » hang hoa, lang ha, nang hoa
su hien » su kien, su tien, thu hien
su viet » so viet
hanh ve » hanh vi, hanh va, hanh kem
hieu he » hieu ve, hiem he, hieu le
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
thu san » thuy san, thu ban, phu san
he nam » ha nam, nghe nam
tu san » tu ban, tu can, vu san

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) OR (thu 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) OR (thu san)) ky lang hoa hoi. hieu he nam thuc vat hanh ve ((su viet) OR (su hien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (thu 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) OR (thu san)) ky lang hoa hoi. hieu he nam thuc vat hanh ve ((su viet) or (su hien))*.