Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
doanh dan » doanh ban, doanh van, doanh dao
lang van » dang van, tang van, hoang van
va doanh » van doanh, vay doanh, va danh
hieu van » hieu va, thien van, lieu va
van hoi » van hoa, van hoc, van hoe
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
van cac » van hac, van cau, van bac
cac hoc » cach hoc, cac hop, bac hoc
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) lang van hoi. hieu van cac hoc va doanh dan ((cua tu) OR (cua thuoc))~.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) lang van hoi. hieu van cac hoc va doanh dan ((cua tu) or (cua thuoc))*.