Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh cac » hanh cac, thanh bac, thanh ca
va thanh » gia thanh, ban thanh, va tinh
van lam » van nam
cac cua » cach cua, cac qua, ca cua
sach ky » sach y, sach ty, sach kem
cao hoi » cau hoi, co hoi, cao hoc
van cam » van nam, van cau, van dam
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky

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: su ((sach ky) OR (sac ky)) nang cao hoi. hieu ((van cam) OR (van lam)) luc va thanh cac cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang cao hoi. hieu ((van cam) OR (van lam)) luc va thanh cac cua triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang cao hoi. hieu ((van cam) OR (van lam)) luc va thanh cac cua triet*.