Perhaps you should try some spelling variations:
viec bach » vien bach, viec ban, viec bao
hieu viec » nhieu viec, hieu ve, sieu viet
may khoa » da khoa, ly khoa, y khoa
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
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 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 (may khoa)). hieu viec bach ((xuc va) OR (tuc va)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((mai khoa) or (may 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 (may khoa)). hieu viec bach ((xuc va) OR (tuc va)) hanh lai cua viet*.