Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
dua tren » dung tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
duoc va » nuoc va, duc va, duoc ma
va quan » van quan, tac quan, hai quan
quan va » quan vi, quan ha, luan 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 nam duoc va quan 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 nam duoc va quan va ((dua tren) or (cua te))*.