Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
duoc ban » duc ban, quoc ban, buoc ban
lam duoc » nam duoc, luat duoc, lam thuoc
su sach » so sach, vu sach
ban dan » ban hang, ban hanh, ban quan
van lam » van nam
sach ty » sach y, sach tu, sach thu
dan va » doan va, dan ca, ban va
cua te » cua tu

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: su sach ty ((xang x) OR (nang x)) hoi. hieu van lam duoc ban dan va ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang x) OR (nang x)) hoi. hieu van lam duoc ban dan va ((dua tren) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang x) OR (nang x)) hoi. hieu van lam duoc ban dan va ((dua tren) or (cua te))*.