Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
xuc ban » duc ban, cuc ban, xuat ban
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
so hai » son hai, su hai, so ha
va cam » va cham, va cac, va cao
anh di » danh di, xanh di, anh d
di cua » dai cua, doi cua, de cua
o hai » co hai, o lai, _ hai

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 ky nang ((o hai) OR (so hai)). hieu va cam ((xuc ban) or (quoc ban)) anh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hai) OR (so hai)). hieu va cam ((xuc ban) OR (quoc ban)) anh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hai) OR (so hai)). hieu va cam ((xuc ban) or (quoc ban)) anh di cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hai) OR (so hai)). hieu va cam ((xuc ban) or (quoc ban)) anh di cua triet*.