Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
lang hoa » hang hoa, lang ha, nang hoa
su triet » su viet, ve triet
su tien » su kien, tu tieng, dau tien
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
su hien » su kien, thu hien, nhu hien
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 lang hoa hoi. hieu ve nam thuc vat hanh va ((su triet) or (((su tien) OR (su hien))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang hoa hoi. hieu ve nam thuc vat hanh va ((su triet) OR (((su tien) OR (su hien)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang hoa hoi. hieu ve nam thuc vat hanh va ((su triet) or (((su tien) OR (su hien))))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang hoa hoi. hieu ve nam thuc vat hanh va ((su triet) or (((su tien) OR (su hien))))*.