Perhaps you should try some spelling variations:
cua triet » su triet, va triet
thanh lam » thanh lap, hanh lam, thanh nam
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
ty nang » ky nang, ty xang, ty hang
cy hoc » ly hoc, co hoc, my hoc

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 ty nang ((y hoc) or (cy hoc)). hieu van cau duc va thanh lam ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((y hoc) OR (cy hoc)). hieu van cau duc va thanh lam ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((y hoc) or (cy hoc)). hieu van cau duc va thanh lam ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((y hoc) or (cy hoc)). hieu van cau duc va thanh lam ((cua triet) OR (cua viet))*.