Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
thanh di » thanh doi, thanh do, thanh dinh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van nam thuc va ((thanh di) or (thanh de)) ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu van nam thuc va ((thanh di) OR (thanh de)) ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu van nam thuc va ((thanh di) or (thanh de)) ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu van nam thuc va ((thanh di) or (thanh de)) ((cua triet) OR (va triet))*.