Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
xuc van » duc van, luc van, vuc van
hanh ve » hanh vi, hanh va
su hien » su kien, su tien, thu hien
nang o » nang co, nang ho, nang ro
va cao » va cac, va co, va dao
o hoi » co hoi, o hoc, o hai
kem » kiem

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach vu nang o hoi. hieu va cao xuc van ((hanh ve) or (hanh kem)) su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang o hoi. hieu va cao xuc van ((hanh ve) OR (hanh kem)) su hien.
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang o hoi. hieu va cao xuc van ((hanh ve) or (hanh kem)) su hien*.