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
mai khoa » tai khoa, dai khoa, mai khoi
may khoa » da khoa, ly khoa, y khoa
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
ca viet » va viet, co viet, hoa viet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
lai ca » lai cua, lai cam, loai ca

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 ca 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 ca 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 ca viet*.