Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc lan » nuoc luan, quoc quan, quoc danh
quoc ban » quoc bao, quoc quan, quoc binh
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
anh di » danh di, xanh di, anh d
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
su hai » su tai
so hai » son hai, so ha, co hai
va cam » va cham, va cac, va cao

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

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