Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, cua triet
hanh sua » hinh su, hanh va, hanh tu
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
vu nang » vuc nang, va nang, vu dang
cam loc » cam lo
y nang » ky nang, ly nang, v nang
loc va » hoc va, luc va
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: su sach ((y nang) or (vu nang)) x hoi. hieu van cam loc va hanh sua ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (vu nang)) x hoi. hieu van cam loc va hanh sua ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (vu nang)) x hoi. hieu van cam loc va hanh sua ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (vu nang)) x hoi. hieu van cam loc va hanh sua ((va triet) OR (ve triet))*.