Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
bac dac » bac dai, ban dac, bac dan
dac ban » cac ban, dac san, duc ban
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va bac » van bac, va cac, va bai
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 va bac dac 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 va bac dac 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 va bac dac ban thanh dai ((cua triet) or (cua te))*.