Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
ve triet » va trien, su triet
thanh di » thanh doi, thanh de, thanh do
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach kem
so viet » hoc viet
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
sach ty » sach y, sach tu, sach thu
ho hoi » hoc hoi, hoa hoi, hoi hoi
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 ((sach ky) OR (sach ty)) nang ho 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 ((sach ky) OR (sach ty)) nang ho 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 ((sach ky) OR (sach ty)) nang ho hoi. hieu ve nam thuc dan thanh di ((ve triet) or (so viet))*".