Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu vo » hieu voi, hieu va, hieu ve
co quoc » cao quoc, co duoc, bo quoc
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, dua tren

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 ((ty nang) or (ky nang)) x ho. hieu vo co quoc ban anh d ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) x ho. hieu vo co quoc ban anh d ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) x ho. hieu vo co quoc ban anh d ((cua tre) or (cua triet))*.