Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
van nhanh » van thanh, van hanh, van nhan
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
ban xuc » ban xu, ban duoc, ban phuc
sach ty » sach y, sach tu, sach thu
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 van ban xuc ((van nhanh) OR (van khanh)) thai 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 van ban xuc ((van nhanh) OR (van khanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((ang xa) or (mang may)) hoi. hieu van ban xuc ((van nhanh) OR (van khanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((ang xa) or (mang may)) hoi. hieu van ban xuc ((van nhanh) OR (van khanh)) thai cua tre*.