Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam thuc » nam thuoc, am thuc, nam thu
va triet » va thiet, va trien, ve triet
thanh di » thanh doi, thanh de, thanh do
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
ho hoi » hoc hoi, hoa hoi, hoi hoi
bac ky » cac ky, ban ky, sac ky
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: su ((xac ky) OR (bac ky)) nang ho hoi. hieu ve nam thuc van thanh di ((va triet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((xac ky) OR (bac ky)) nang ho hoi. hieu ve nam thuc van thanh di ((va triet) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((xac ky) OR (bac ky)) nang ho hoi. hieu ve nam thuc van thanh di ((va triet) or (so viet))*".