Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
nam thuoc » nam thuc, nam thu, nha thuoc
su triet » su viet, su tien, ve triet
thuoc va » thuc va, thuoc ma, thuong va
hieu van » hieu va, thien van, lieu va
hanh va » hanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa

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 ky tang ma hoi. hieu van nam thuoc va ((hanh va) or (hang va)) ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoi. hieu van nam thuoc va ((hanh va) OR (hang va)) ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang ma hoi. hieu van nam thuoc va ((hanh va) or (hang va)) ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ma hoi. hieu van nam thuoc va ((hanh va) or (hang va)) ((cua triet) OR (su triet))*.