Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cuc ban » cua ban, cac ban, cuu ban
duc ban » duc tan, duc van, dua ban
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
ve cua » le cua, de cua, te cua
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. hieu ve cam ((cuc ban) or (duc ban)) hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. hieu ve cam ((cuc ban) OR (duc ban)) hanh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. hieu ve cam ((cuc ban) or (duc ban)) hanh ve cua tre*.