Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham thuc » nham thuc, pham thuc, thai thuc
tam thuc » am thuc, nam thuc, dam thuc
thu sach » tu sach, thuat sach, thuoc sach
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang ma » sang ma, nang cao, mang may
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 ky ((nang ma) or (tang ma)) hoa. hieu va ((tham thuc) OR (tam thuc)) va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (tang ma)) hoa. hieu va ((tham thuc) OR (tam thuc)) va hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) or (tang ma)) hoa. hieu va ((tham thuc) OR (tam thuc)) va hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) or (tang ma)) hoa. hieu va ((tham thuc) OR (tam thuc)) va hanh di cua triet*.