Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh do, thanh dinh
va triet » va thiet, va trien, ve triet
thanh de » hanh de, thanh ve, thanh do
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
so viet » hoc viet
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
xac ky » cac ky, sac ky, bac ky
ve nam » he nam, va nam, le nam
ho hoi » hoc hoi, hoa hoi, hoi hoi
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang ho hoi. hieu ve nam thuc van ((thanh di) OR (thanh de)) ((va triet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ho hoi. hieu ve nam thuc van ((thanh di) OR (thanh de)) ((va triet) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ho hoi. hieu ve nam thuc van ((thanh di) OR (thanh de)) ((va triet) or (so viet))*".