Perhaps you should try some spelling variations:
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
mai khoa » tai khoa, may khoa, dai khoa
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 tu nang ((mai khoa) or (da khoa)). hieu viec bach ((xuc va) or (tuc va)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((mai khoa) OR (da khoa)). hieu viec bach ((xuc va) OR (tuc va)) hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((mai khoa) or (da khoa)). hieu viec bach ((xuc va) or (tuc va)) hanh lai cua viet*.