Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
ban hanh » ban hang
tham luc » than luc, tham nuoc, tham thuc
van anh » van thanh, tuan anh, van minh
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu va tham luc ((ban hanh) or (van anh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu va tham luc ((ban hanh) OR (van anh)) vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang ma)) hoi. hieu va tham luc ((ban hanh) or (van anh)) vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu va tham luc ((ban hanh) or (van anh)) vi cua viet*.