Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
ky sang » ky dang, ky tang, duy sang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
cac thu » cach thuc, cac thoi
thu van » thuc van, thuy van, tu van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 ((ky sang) or (ky nang)) mai hoi. ((hieu va) or (lieu va)) cac thu van hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky nang)) mai hoi. ((hieu va) OR (lieu va)) cac thu van hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky nang)) mai hoi. ((hieu va) or (lieu va)) cac thu van hanh hai cua tre*.