Perhaps you should try some spelling variations:
tu tuong » tu dong
sach vu » sach va, sach tu, sach uu
su hien » su kien, su tien, thu hien
hanh ve » hanh vi, hanh va, hanh kem
duc van » duc va, duc tan, duc manh
te sach » toc sach
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
luc van » luoc van, luu van, luc va
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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

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