Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
tang ma » tang van
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
va doan » va doanh, van doan, va dan
doan vi » doan va, don vi, doan thi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu ((nang xa) or (((tang ma) OR (mang may)))) hoi. hieu van nam thuoc va doan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((nang xa) OR (((tang ma) OR (mang may)))) hoi. hieu van nam thuoc va doan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu ((nang xa) or (((tang ma) OR (mang may)))) hoi. hieu van nam thuoc va doan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach tu ((nang xa) or (((tang ma) OR (mang may)))) hoi. hieu van nam thuoc va doan vi cua triet*.