Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
chat thuc » thuat thuc, nhan thuc, chat thai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
thuc dai » thuc dan, thuc day, thuc tai
dai danh » dai dang, dao danh, day danh
sach ky » sac ky, sach y, sach ty
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, dua tren
x hoi » xa hoi, o hoi, 5 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 ky nang ((x hoi) OR (x ho)). hieu van chat thuc dai danh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (x ho)). hieu van chat thuc dai danh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (x ho)). hieu van chat thuc dai danh di ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (x ho)). hieu van chat thuc dai danh di ((cua tre) or (cua triet))*.