Perhaps you should try some spelling variations:
voi nang » voi hang, hoi nang, voi rang
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
hanh de » hanh ve
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
va nang » van nang, da nang, cam nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((voi nang) or (va nang)) x hoi. hieu ve cam thuc va ((hanh de) or (hanh kem)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((voi nang) OR (va nang)) x hoi. hieu ve cam thuc va ((hanh de) OR (hanh kem)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((voi nang) or (va nang)) x hoi. hieu ve cam thuc va ((hanh de) or (hanh kem)) cuu tre*.