Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham thuc » nham thuc, pham thuc, tham thuc
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va nang » van nang, da nang, cam nang
nang di » nang du, hang di, nang ji
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 lang xa hoi. hieu ve cham thuc va nang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuoc sach)) ky lang xa hoi. hieu ve cham thuc va nang di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuoc sach)) ky lang xa hoi. hieu ve cham thuc va nang di cua tre*.