Perhaps you should try some spelling variations:
thuc dang » thuoc dang, thuc dan, thuc dung
dang hang » dang hoang, dang hung, dang hanh
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
nam thuc » nam thuoc, am thuc, nam thu
thi van » thi lan, thi hanh, thi nang
hang di » hang doi, hang vi, hang dien
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 hang 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 hang 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 hang di ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang x)) hoi. thi van nam thuc dang hang di ((va triet) OR (ve triet))*.