Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vat xanh » vat thanh, sat anh, dat anh
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
xanh di » danh di, vanh dai, xanh tai
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
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 vat xanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cam thuc vat 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 vat xanh di cua tre*.