Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
qua bac » qua ban, qua cac, cua bac
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
bac di » bac dai, bac si, cac di
di ban » dia ban, doi ban, di san
cua te » cua tu
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: tu sach ((y nang) or (v nang)) x hoi. hieu qua bac di ban thanh dai ((cua triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) x hoi. hieu qua bac di ban thanh dai ((cua triet) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) x hoi. hieu qua bac di ban thanh dai ((cua triet) or (cua te))*.