Perhaps you should try some spelling variations:
thanh moi » thanh loi, thanh hoa, thanh hai
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
nha hoc » nha thuoc, khoa hoc, thai hoc
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
tu san » thu san, tu ban, tu can
moi va » hoi va, mai va, moi ve
ke san » ke dan
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ke san) or (tu san)) ky lang ha hoi. hieu va ((nha hoc) OR (nha nuoc)) va thanh moi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ke san) OR (tu san)) ky lang ha hoi. hieu va ((nha hoc) OR (nha nuoc)) va thanh moi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ke san) or (tu san)) ky lang ha hoi. hieu va ((nha hoc) OR (nha nuoc)) va thanh moi va triet".
• Adding a wildcard symbol may retrieve word variants: ((ke san) or (tu san)) ky lang ha hoi. hieu va ((nha hoc) OR (nha nuoc)) va thanh moi va triet*.