Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
thuc giai » thuoc giao, hoc giai, thuc thai
thanh doi » thanh loi, thanh moi, thanh do
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
ro hoi » co hoi, o hoi, ro doi
mo hoi » mo phoi, mo hoc, co hoi

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 y nang ((ro hoi) OR (mo hoi)). hieu van nam thuc giai thanh doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((ro hoi) OR (mo hoi)). hieu van nam thuc giai thanh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ro hoi) OR (mo hoi)). hieu van nam thuc giai thanh doi cua triet*.