Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty hang, ly nang
hieu va » lieu va, hieu qua
xu van » tu van, vu van, su van
kem va » kiem va, kiem van
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: so sach ((ty nang) or (ty xang)) x hoi. ((hieu van) or (hieu va)) chao xu van hanh kem va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) x hoi. ((hieu van) OR (hieu va)) chao xu van hanh kem va triet.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) x hoi. ((hieu van) or (hieu va)) chao xu van hanh kem va triet*.