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