Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
ngu danh » ngu anh, ngan danh, nam danh
ngu dan » ngu van, nguoi dan, nghe dan
ca viet » va viet, co viet, hoa viet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
dai ca » dai cua, dai va, bai ca
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 (lang xa)) hoi. hieu va thanh ((ngu danh) OR (ngu dan)) thanh dai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang xa)) hoi. hieu va thanh ((ngu danh) OR (ngu dan)) thanh dai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (lang xa)) hoi. hieu va thanh ((ngu danh) OR (ngu dan)) thanh dai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang xa)) hoi. hieu va thanh ((ngu danh) OR (ngu dan)) thanh dai ca viet*.