Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
chet duc » chet duoc, viet duc, che duoc
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
so sach » so sanh, bo sach, co sach
te sach » toc sach
hieu va » lieu va, hieu qua
va chet » va chiet, va che, va chat
x hoi » xa hoi, o hoi, x ho

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

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