Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
ve cai » va cai, ve cac, ve tai
loc va » hoc va, luc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (nang ma)) hoi. hieu ((ve cai) OR (vu cham)) loc va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) OR (nang ma)) hoi. hieu ((ve cai) or (vu cham)) loc va hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) OR (nang ma)) hoi. hieu ((ve cai) or (vu cham)) loc va hanh vi cua viet*.