Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va dinh » van dinh, va kinh, va tinh
dinh du » dinh duc, dinh cu, dinh tu
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
du cuu » tu cuu

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 y ((nang xa) or (lang xa)) hoi. hieu va cam luc va dinh du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((nang xa) OR (lang xa)) hoi. hieu va cam luc va dinh du cuu tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((nang xa) or (lang xa)) hoi. hieu va cam luc va dinh du cuu tre*.