Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
lang hoa » hang hoa, lang ha, nang hoa
su viet » so viet
hanh va » hang va, hanh vi
hanh ve » hanh vi, hanh kem
su tien » su kien, su hien, tu tieng
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
ve nam » he nam, va nam, le nam
sai ky » sac ky
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky lang hoa hoi. hieu ve nam thuc vat ((hanh ve) or (hanh va)) ((su viet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky lang hoa hoi. hieu ve nam thuc vat ((hanh ve) OR (hanh va)) ((su viet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sai ky lang hoa hoi. hieu ve nam thuc vat ((hanh ve) or (hanh va)) ((su viet) or (su tien))*.