Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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: ((su sach) OR (thuoc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cam thuc va xanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (thuoc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cam thuc va xanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (thuoc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cam thuc va xanh di cua tre*.