Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va
x hoi » xa hoi, o hoi, x ho
le va » le van, ly va, ke va
te va » tu va

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 ((ly nang) or (ky nang)) x hoi. hieu va nam thu va dinh ((le va) OR (te va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) x hoi. hieu va nam thu va dinh ((le va) OR (te va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ky nang)) x hoi. hieu va nam thu va dinh ((le va) OR (te va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ky nang)) x hoi. hieu va nam thu va dinh ((le va) OR (te va)) triet*.