Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cap nuoc » dat nuoc
va dinh » van dinh, va kinh, vu dinh
nang xa » nang x, nang ma, mang xa
va tinh » may tinh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cap » ve cac, le cap, ve cai
vi su » va su, ve su, ki su

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 ve cap nuoc ((va dinh) or (va tinh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang xa)) hoi. hieu ve cap nuoc ((va dinh) OR (va tinh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang xa)) hoi. hieu ve cap nuoc ((va dinh) or (va tinh)) vi su triet*.