Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cua viet » ca viet, hoa viet, cua vat
may khoa » da khoa, ly khoa, y khoa
hanh lai » hanh lam, hanh tai, thanh lap
viec bao » viec ban, viec lam, viec va
mai khoa » tai khoa, dai khoa, mai khoi
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 (may khoa)). hieu viec bao ((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 (may khoa)). hieu viec bao ((xuc va) OR (tuc va)) hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((mai khoa) or (may khoa)). hieu viec bao ((xuc va) or (tuc va)) hanh lai cua viet*.