Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
va thanh » gia thanh, ban thanh, va tinh
hoc sach » hoc sinh, hoc cac, hoc anh
va than » van than, va phan, va tham
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty xang, ty hang
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty nang ((o hoc) or (xa hoi)). lieu ((va than) OR (va thanh)) duc ban hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang ((o hoc) OR (xa hoi)). lieu ((va than) OR (va thanh)) duc ban hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty nang ((o hoc) or (xa hoi)). lieu ((va than) OR (va thanh)) duc ban hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ((o hoc) or (xa hoi)). lieu ((va than) OR (va thanh)) duc ban hanh di cua triet*.