Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
ban thanh » ban hanh, ban hang
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
thanh vi » hanh vi, thanh va, thanh ve
quoc ban » quoc bao, quoc lan, quoc quan
cua tuc » cua duc, cua tu, luat tuc
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
va cam » va cham, va cao, va cai

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 vu nang mai khoi. hieu ((va cam) OR (va cac)) quoc ban thanh vi ((cua tuc) OR (cua thuoc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang mai khoi. hieu ((va cam) or (va cac)) quoc ban thanh vi ((cua tuc) OR (cua thuoc))~".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang mai khoi. hieu ((va cam) or (va cac)) quoc ban thanh vi ((cua tuc) OR (cua thuoc))*.