Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
van dai » vanh dai, van dao, van hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((mai hoi) OR (ma hoa)). hieu qua cac duc va van dai cua triet~.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((mai hoi) or (ma hoa)). hieu qua cac duc va van dai cua triet*.