Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, chuc van
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, 5 hoi
ve su » va su
kien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach vu nang ((x hoi) or (x ho)). hieu va cao ((vuc van) OR (thuc van)) thanh ve su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ((x hoi) OR (x ho)). hieu va cao ((vuc van) OR (thuc van)) thanh ve su kien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang ((x hoi) or (x ho)). hieu va cao ((vuc van) OR (thuc van)) thanh ve su kien".
• Adding a wildcard symbol may retrieve word variants: su sach vu nang ((x hoi) or (x ho)). hieu va cao ((vuc van) OR (thuc van)) thanh ve su kien*.