Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
van lam » van nam
lam tuc » lam thuoc, lam truoc, luat tuc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, v nang, may nang
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 ((y nang) or (ly nang)) mai hoi. hieu van lam tuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ly nang)) mai hoi. hieu van lam tuc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (ly nang)) mai hoi. hieu van lam tuc va hanh vi cua viet*.