Perhaps you should try some spelling variations:
ta thanh » tai thanh, va thanh, ha thanh
so sach » so sanh, bo sach, co sach
hieu va » hieu qua
sach ty » sach y, sach tu, sach thu
ve cua » le cua, de cua, te cua
nam tu » nam thu, nam thuc
xang x » nang x
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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: so sach ty xang x hoi. ((hieu va) OR (lieu va)) nam tu ((gia thanh) OR (ta thanh)) ve cua te~.
• Adding a wildcard symbol may retrieve word variants: so sach ty xang x hoi. ((hieu va) or (lieu va)) nam tu ((gia thanh) or (ta thanh)) ve cua te*.