Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bach » vien bach, viec ban, viec bao
bach tuoc » sach duoc, sach nuoc
nhan tai » hang tai, van tai, toan tai
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
tuoc va » thuoc va, nuoc va, duoc va
va nhan » van nhan, ca nhan, va phan
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang ma) or (sang ma)) hoi. hieu viec bach tuoc va nhan tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang ma) OR (sang ma)) hoi. hieu viec bach tuoc va nhan tai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang ma) or (sang ma)) hoi. hieu viec bach tuoc va nhan tai cua tre*.