Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
quoc ban » quoc bao, quoc lan, quoc quan
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
benh di » benh dai, ben di, benh da
cua tre » cua te, cuu tre, dua tren
va cam » va cham, va cac, va cao
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: thu sach ky nang x hoi. hieu va cam ((quoc ban) or (duc ban)) benh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu va cam ((quoc ban) OR (duc ban)) benh di ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu va cam ((quoc ban) or (duc ban)) benh di ((cua tre) OR (cua triet))*".