Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
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: ((tu sach) or (so sach)) y nang x hoi. ((hieu van) or (hieu va)) cam xuc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) y nang x hoi. ((hieu van) OR (hieu va)) cam xuc van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) y nang x hoi. ((hieu van) or (hieu va)) cam xuc van hanh vi cua viet*.