Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ky ((nang ma) or (tang ma)) hoa. hieu va tham thuc va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky ((nang ma) OR (tang ma)) hoa. hieu va tham thuc va hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky ((nang ma) or (tang ma)) hoa. hieu va tham thuc va hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky ((nang ma) or (tang ma)) hoa. hieu va tham thuc va hanh di cua triet*.