Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh san
thanh hoa » thanh pho
va triet » va thiet, ve triet, cua triet
va trien » va truyen, va thiet, va tuyen
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang xa hoi. hieu va cac duc va ((thanh hai) OR (thanh hoa)) ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang xa hoi. hieu va cac duc va ((thanh hai) OR (thanh hoa)) ((va triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang xa hoi. hieu va cac duc va ((thanh hai) OR (thanh hoa)) ((va triet) or (va trien))*".