Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham thuc » nham thuc, pham thuc, tham thuc
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
va cham » va chat, va tham
vu sach » vu bach, su sach, vu khach
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
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: ((vu sach) or (thuoc sach)) ky ((nang xa) or (nang x)) hoi. hieu va cham thuc dan hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky ((nang xa) OR (nang x)) hoi. hieu va cham thuc dan hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky ((nang xa) or (nang x)) hoi. hieu va cham thuc dan hanh di cua tre*.