Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
va thanh » gia thanh, ban thanh, le thanh
sach ky » sac ky, sach y, sach ty
ve pham » v pham, ve phan, ve phat
va tinh » may tinh
lai cua » dai cua, hai cua, lai chau
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang o hoi. hieu ((ve pham) or (vi pham)) duc ((va thanh) OR (va tinh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang o hoi. hieu ((ve pham) OR (vi pham)) duc ((va thanh) OR (va tinh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang o hoi. hieu ((ve pham) or (vi pham)) duc ((va thanh) OR (va tinh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang o hoi. hieu ((ve pham) or (vi pham)) duc ((va thanh) OR (va tinh)) lai cua triet*.