Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh di » thanh doi, thanh de, thanh do
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
so viet » hoc viet
ve nam » he nam, va nam, le nam
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 nang ho hoi. hieu ve nam thuc dan thanh di ((((ve triet) OR (va trien))) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ho hoi. hieu ve nam thuc dan thanh di ((((ve triet) OR (va trien))) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ho hoi. hieu ve nam thuc dan thanh di ((((ve triet) OR (va trien))) or (so viet))*".