Perhaps you should try some spelling variations:
thanh thuc » thanh thuy, nhanh thuc, thach thuc
van thanh » ban thanh, van tuan
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, dao hanh, day manh
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
de cua » le cua, te cua, dieu cua
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((x hoi) OR (o hoi)). hieu van thanh thuc ((day hanh) or (day nhanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((x hoi) OR (o hoi)). hieu van thanh thuc ((day hanh) OR (day nhanh)) de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((x hoi) OR (o hoi)). hieu van thanh thuc ((day hanh) or (day nhanh)) de cua tre*".