Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
thuc dang » thuoc dang, thuc dan, thuc dung
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
thanh di » thanh doi, thanh de, thanh do
nam thuc » nam thuoc, am thuc, nam thu
thi van » thi lan, thi hanh, thi nang
nang xa » lang xa, nang ma, mang xa
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (nang x)) hoi. thi van nam thuc dang thanh di ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang x)) hoi. thi van nam thuc dang thanh di ((va triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (nang x)) hoi. thi van nam thuc dang thanh di ((va triet) OR (ve triet))*".