Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su triet » su viet, su tien, ve triet
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac bac » cac bai, cac ban, cac cach
tu san » thu san, tu ban, tu can
va dao » ca dao
san ky » sang ky, van ky, dan ky
va dan » ca dan, va dau, va dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky lang xa hoi. hieu va cac bac ((va dan) or (va dao)) hai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang xa hoi. hieu va cac bac ((va dan) OR (va dao)) hai ((su triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu san ky lang xa hoi. hieu va cac bac ((va dan) or (va dao)) hai ((su triet) or (cua viet))*.