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