Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
qua cham » qua hai, qua cac, va cham
vu sach » vu bach, vu khach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
su sach » so sach
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 (su sach)) y ((lang xa) or (nang ma)) hoi. hieu qua cham thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) y ((lang xa) OR (nang ma)) hoi. hieu qua cham thuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) y ((lang xa) or (nang ma)) hoi. hieu qua cham thuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) y ((lang xa) or (nang ma)) hoi. hieu qua cham thuc va hanh vi cua tre*.