Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, can thuc
dung doi » huong doi, dung tai, dung co
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
va dung » van dung, va duong, vat dung
cam thu » nam thu, cac thu, ca thu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang x hoi. ((hieu ve) or (hieu va)) ((cam thuc) or (cam thu)) va dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. ((hieu ve) OR (hieu va)) ((cam thuc) OR (cam thu)) va dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. ((hieu ve) or (hieu va)) ((cam thuc) or (cam thu)) va dung doi cua tre*.