Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thu hoach
kem cua » em cua, keo cua, diem cua
va chat » van chat, va phat, cao chat
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
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: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu va chat ((goc va) or (loc va)) hanh kem cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu va chat ((goc va) OR (loc va)) hanh kem cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) y nang o hoi. lieu va chat ((goc va) or (loc va)) hanh kem cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) y nang o hoi. lieu va chat ((goc va) or (loc va)) hanh kem cua triet*.