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