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
hoc viet » hoc hien
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
ve nam » he nam, va nam, le nam
sac ky » cac ky, sai ky
ho hoi » hoc hoi, hoa hoi, hoi hoi
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 nang ho hoi. hieu ve nam thuc van thanh di ((va triet) or (((so viet) OR (hoc viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ho hoi. hieu ve nam thuc van thanh di ((va triet) OR (((so viet) OR (hoc viet))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ho hoi. hieu ve nam thuc van thanh di ((va triet) or (((so viet) OR (hoc viet))))*".