Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh lam » thanh lap, hanh lam, thanh nam
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hoi hoi » hoi hoc, hoc hoi, hoi doi
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, su sach, te sach
ho hoi » hoc hoi, hoa hoi, 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: tu sach ky tang ((ho hoi) OR (hoi hoi)). hieu van cau duc va thanh lam ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ((ho hoi) OR (hoi hoi)). hieu van cau duc va thanh lam ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang ((ho hoi) OR (hoi hoi)). hieu van cau duc va thanh lam ((cua triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ((ho hoi) OR (hoi hoi)). hieu van cau duc va thanh lam ((cua triet) or (su triet))*.