Perhaps you should try some spelling variations:
quoc bao » quoc oai, hoc bao, quoc va
te sach » toc sach
san cua » sang cua, ban cua, dan cua
duc ban » duc tan, duc van, dua ban
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mat hoi » mai hoi, sat hoi, luat hoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
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: te sach ky dang ((mat hoi) OR (mat troi)). hieu va cam ((duc ban) or (quoc bao)) thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ((mat hoi) OR (mat troi)). hieu va cam ((duc ban) OR (quoc bao)) thanh san cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ((mat hoi) OR (mat troi)). hieu va cam ((duc ban) or (quoc bao)) thanh san cua tre*".