Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hanh va » hang va
xuc van » duc van, luc van, vuc van
su tien » su kien, su hien, tu tieng
tu nang » tru nang, tu nong, tu nano
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
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: tu sach tu nang x hoi. hieu ((va cam) OR (va cao)) xuc van ((hanh vi) OR (hanh va)) su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang x hoi. hieu ((va cam) OR (va cao)) xuc van ((hanh vi) or (hanh va)) su tien~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. hieu ((va cam) OR (va cao)) xuc van ((hanh vi) or (hanh va)) su tien*.