Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
cao truc » cau truc, vao truc, cao thuoc
va thanh » gia thanh, ban thanh, va tinh
hieu va » hieu qua
sach tu » sach thu, cach tu, sach ty
va hanh » van hanh, va danh, ban hanh
tu nang » tru nang, tu nong, tu nano
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: thuoc sach tu nang o hoi. ((hieu va) OR (lieu va)) cao truc ((va hanh) or (va thanh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach tu nang o hoi. ((hieu va) OR (lieu va)) cao truc ((va hanh) OR (va thanh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach tu nang o hoi. ((hieu va) OR (lieu va)) cao truc ((va hanh) or (va thanh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach tu nang o hoi. ((hieu va) OR (lieu va)) cao truc ((va hanh) or (va thanh)) lai cua triet*.