Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
van hac » van hoc, van ha, van hai
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, vuc van
van bac » van ban, van bao, dan bac
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, dang xay
xang xa » lang xa, ang xa, dang xay
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 ty ((xang xa) or (mang xa)) hoi. hieu ((van bac) or (van hac)) xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (mang xa)) hoi. hieu ((van bac) OR (van hac)) xuc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang xa) or (mang xa)) hoi. hieu ((van bac) or (van hac)) xuc van hanh tai cua tre*.