Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
va hanh » van hanh, va danh, ban hanh
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
de cua » le cua, te cua, dieu cua
ve cam » ve cham, ve cac, va cam
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: te sach ty nang ((x hoi) or (o hoi)). hieu ve cam tuc ((va hanh) or (va thanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (o hoi)). hieu ve cam tuc ((va hanh) OR (va thanh)) de cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((x hoi) or (o hoi)). hieu ve cam tuc ((va hanh) or (va thanh)) de cua tre*.