Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van dinh » van minh, va dinh, xuan dinh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cau » van dau, van hau, van chat
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang x hoi. thien van cau truc ((van dinh) or (van dich)) dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x hoi. thien van cau truc ((van dinh) OR (van dich)) dau cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang x hoi. thien van cau truc ((van dinh) or (van dich)) dau cua tre*.