Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh doi » thanh loi, thanh moi, thanh do
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
ma hoi » xa hoi, ma hoa, me hoi
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc va thanh doi ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang ((ma hoi) OR (mai hoi)). hieu ve nam thuc va thanh doi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc va thanh doi ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: te san ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc va thanh doi ((cua triet) OR (su triet))*.