Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
lam cua » nam cua, lam chat
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((co hoi) or (o lai)). hieu van cau duc ((va thanh) or (ban thanh)) lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((co hoi) OR (o lai)). hieu van cau duc ((va thanh) OR (ban thanh)) lam cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((co hoi) or (o lai)). hieu van cau duc ((va thanh) or (ban thanh)) lam cua triet*.