Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
trung va » truong va, trang va, trung ha
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
van lam » van nam
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
tuc va » thuc va, truc va, tuc xa
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: su ((sach ty) or (sach y)) nang o hoi. hieu van lam ((tuc va) or (trung va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang o hoi. hieu van lam ((tuc va) OR (trung va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang o hoi. hieu van lam ((tuc va) or (trung va)) hanh vai cua tre*.