Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
cau duc » cao duc, cau luc, chu duc
ty nang » ky nang, ty xang, ty hang
van cau » van dau, van hau, van chat
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) OR (thanh lap)) cua triet~.
• 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) OR (thanh lap)) cua triet.
• 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) OR (thanh lap)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((y hoc) or (cy hoc)). hieu van cau duc va ((thanh lam) OR (thanh lap)) cua triet*.