Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
sui van » bui van, su van, cuoi van
viec bo » viec bao, viec bot, viec so
sach ky » sac ky, sach ty, sach kem
vi cua » vai cua, di cua
bo sui » bo su, bo sua
cua te » cua tu
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: tu ((sach ky) or (sach y)) nang ((x hoi) or (o hoi)). hieu viec bo sui van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((x hoi) OR (o hoi)). hieu viec bo sui van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((x hoi) or (o hoi)). hieu viec bo sui van hanh vi cua te*.