Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bao » viec ban, viec lam, viec va
thanh va » thanh van, thanh ha, thanh ve
tu sach » thu sach, su sach, te sach
bao tac » bao lac, bao tay, bao thuc
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, me hoi
gia » giao

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 y sang ((ma hoi) or (ma hoa)). hieu viec bao tac gia ((thanh va) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ((ma hoi) OR (ma hoa)). hieu viec bao tac gia ((thanh va) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y sang ((ma hoi) or (ma hoa)). hieu viec bao tac gia ((thanh va) or (hanh va)) cuu tre*.