Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
thanh ca » thanh cha, thanh cac, thanh ha
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
ca cua » co cua
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (bo sach)) ky nang ma hoi. hieu ((ve cam) OR (va cam)) quoc ban thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (bo sach)) ky nang ma hoi. hieu ((ve cam) OR (va cam)) quoc ban thanh ca cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (bo sach)) ky nang ma hoi. hieu ((ve cam) OR (va cam)) quoc ban thanh ca cua tre*".