Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh ban » thanh ban, hang ban, hanh san
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
ban cua » ban quan
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay

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 ((ang xa) or (mang may)) hoi. hieu va bai vuc van hanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((ang xa) OR (mang may)) hoi. hieu va bai vuc van hanh ban cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((ang xa) or (mang may)) hoi. hieu va bai vuc van hanh ban cua tre*.