Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dinh dien » tinh dien, kinh dien, dich dien
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, mang xa
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dinh dien ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dinh dien ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dinh dien ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) OR (nang ma)) hoi. hieu va cam tuc va dinh dien ((cua te) or (va triet))*.