Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
nang mai » nang tai, lang mai, nang cai
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang mai) OR (nang ma)) hoi. hieu ve tham thuc day hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang mai) OR (nang ma)) hoi. hieu ve tham thuc day hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang mai) OR (nang ma)) hoi. hieu ve tham thuc day hanh vai cua triet*.