Perhaps you should try some spelling variations:
khanh van » thanh van, khanh vinh, hanh va
hieu vien » hieu hien, hieu viec, thieu nien
hanh vai » hanh va, hanh tai, hanh van
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
bach vo » bach hoa, bach mao, bach van
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
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: bo sach ty nang o hoi. hieu vien bach vo van ((((hanh vai) or (khanh van))) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang o hoi. hieu vien bach vo van ((((hanh vai) OR (khanh van))) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang o hoi. hieu vien bach vo van ((((hanh vai) or (khanh van))) or (hanh vi)) cua tre*.