Perhaps you should try some spelling variations:
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
bach tac » bach tuoc, bach mai, canh tac
thanh va » thanh van, thanh ha, thanh ve
tu sach » thu sach, su sach, te sach
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 bach 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 bach tac gia ((thanh va) OR (hanh va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang ((ma hoi) OR (ma hoa)). hieu viec bach 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 bach tac gia ((thanh va) or (hanh va)) cuu tre*.