Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
va dinh » van dinh, va kinh, va tinh
dinh le » dinh ve, dinh ly, dinh ket
thu va » thuc va, thue va, tu va
x hoi » xa hoi, o hoi, x ho
le va » le van, te va, ly va
thiet » thieu

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 van nam thu va dinh le va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) x hoi. hieu van nam thu va dinh le va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ky nang)) x hoi. hieu van nam thu va dinh le va thiet*.