Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
ma hoi » mai hoi, ma hoa, me hoi
va cau » van cau, va cac, va dau
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 ty xang ((ma hoi) OR (xa hoi)). hieu va cau luc van hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang ((ma hoi) OR (xa hoi)). hieu va cau luc van hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang ((ma hoi) OR (xa hoi)). hieu va cau luc van hanh vi cua viet*.