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
nang xa » nang x, lang xa, nang ma
hieu 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
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 xa hoi. ((hieu va) OR (lieu 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 xa hoi. ((hieu va) OR (lieu va)) cao xuc van ((hanh ve) OR (hanh kem)) su hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu nang xa hoi. ((hieu va) OR (lieu va)) cao xuc van ((hanh ve) or (hanh kem)) su hien".
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang xa hoi. ((hieu va) OR (lieu va)) cao xuc van ((hanh ve) or (hanh kem)) su hien*.