Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
cau duc » cao duc, cau luc, chu duc
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
te sach » toc sach
nang o » nang co, nang ho, nang ro
va cau » van cau, va cac, va dau
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: ((tu sach) OR (te sach)) ky nang o hoi. hieu va cau duc va ((thanh lam) or (thanh lap)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang o hoi. hieu va cau duc va ((thanh lam) OR (thanh lap)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang o hoi. hieu va cau duc va ((thanh lam) or (thanh lap)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang o hoi. hieu va cau duc va ((thanh lam) or (thanh lap)) cua triet*.