Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
qua tham » qua cham, qua than, qua thanh
ke mang » ke nang, ke trang
tay hoi » tay ho, tao hoi, tay thai
ky mang » ky nang, ky dang, ky tang
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
tu sac » tu cac, tu san, tu bac

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) OR (tu sach)) ((ky mang) or (ke mang)) tay hoi. hieu qua tham thuc ban hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ((ky mang) OR (ke mang)) tay hoi. hieu qua tham thuc ban hanh vai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ((ky mang) or (ke mang)) tay hoi. hieu qua tham thuc ban hanh vai cua viet*".