Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach xu
sach uu » sach luu, sach xu, sach dau
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
du van » duy van, duc van, tu van
di cua » dai cua, doi cua, de 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: thu ((sach ty) or (((sach tu) or (sach uu)))) nang o hoi. lieu va cac du van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (((sach tu) OR (sach uu)))) nang o hoi. lieu va cac du van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (((sach tu) or (sach uu)))) nang o hoi. lieu va cac du van hanh di cua tre*.