Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
cua tu » cua tuc, cua su, cua cu
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 va nang ((x hoi) or (o hoi)). hieu va cac duc van hanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va nang ((x hoi) OR (o hoi)). hieu va cac duc van hanh di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: te sach va nang ((x hoi) or (o hoi)). hieu va cac duc van hanh di ((cua te) or (cua tu))*.