Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cao, va cai
xuc va » duc va, tuc va, luc va
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: thu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((va cam) or (va cac)) xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((va cam) OR (va cac)) xuc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((va cam) or (va cac)) xuc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((va cam) or (va cac)) xuc va hanh vi cua viet*.