Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
va triet » va thiet, va trien, ve triet
co sach » bo sach, cuon sach, hoc sach
te sach » toc sach
hieu va » lieu va, hieu qua
va chet » va chiet, va che, va chat
duoc va » nuoc va, duc va, duoc ma
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
x hoi » xa hoi, o hoi, x ho
va va » va van, va vua, va vai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (te sach)) ky nang x hoi. hieu va chet duoc va hanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (te sach)) ky nang x hoi. hieu va chet duoc va hanh va va triet.
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (te sach)) ky nang x hoi. hieu va chet duoc va hanh va va triet*.