Perhaps you should try some spelling variations:
te sach » toc sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, x ho, 5 hoi
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 va nang ((x hoi) or (o hoi)). hieu va cac duc va 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 va 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 va hanh di ((cua te) or (cua tu))*.