Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
ty hang » ly hang, ty xang, thi hang
ty sang » ty xang, duy sang, thu sang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ((ty sang) or (ty hang)) ma hoi. ((hieu ve) or (hieu va)) cam duc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty sang) OR (ty hang)) ma hoi. ((hieu ve) OR (hieu va)) cam duc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty sang) or (ty hang)) ma hoi. ((hieu ve) or (hieu va)) cam duc va hanh dai cua tre*.