Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
ve triet » va trien
lang hoa » hang hoa, lang ha, nang hoa
su triet » su viet
hanh va » hang va, hanh vi
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
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
tu sac » tu sach, tu cac, tu 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 sac ky lang hoa hoi. hieu ve nam thuc vat hanh va ((((su triet) or (ve triet))) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang hoa hoi. hieu ve nam thuc vat hanh va ((((su triet) OR (ve triet))) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang hoa hoi. hieu ve nam thuc vat hanh va ((((su triet) or (ve triet))) or (su tien))*.