Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
chat huu » pham huu
han hanh » ban hanh, van hanh, han danh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
lam ha » nam ha, dam ha, lam chat
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 x hoi. ((hieu van) or (hieu va)) chat huu han hanh ((nam va) or (lam ha)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. ((hieu van) OR (hieu va)) chat huu han hanh ((nam va) OR (lam ha)) triet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang x hoi. ((hieu van) or (hieu va)) chat huu han hanh ((nam va) or (lam ha)) triet*.