Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
so sach » so sanh, co sach, hoc sach
mao hoi » tao hoi, mo hoi, tao khoi
bo sach » co sach, hoc sach
ly van » le van, ly va, ly von
ve cam » ve cham, ve cac, va cam
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) or (bo sach)) ly van ((mao hoi) OR (mai hoi)). hieu ve cam tuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ly van ((mao hoi) OR (mai hoi)). hieu ve cam tuc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) ly van ((mao hoi) OR (mai hoi)). hieu ve cam tuc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ly van ((mao hoi) OR (mai hoi)). hieu ve cam tuc va hanh vi cua viet*.