Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach uu » sach luu, sach tu, sach xu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach uu)) ((nang xa) or (nang ma)) hoi. hieu ve cham thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach uu)) ((nang xa) OR (nang ma)) hoi. hieu ve cham thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach uu)) ((nang xa) or (nang ma)) hoi. hieu ve cham thuc va hanh vai cua tre*.