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