Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
nang mai » nang ma, nang tai, lang mai
quoc ban » quoc bao, quoc lan, quoc quan
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
va cao » va cac, va co, va dao
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cai

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) or (thuat sach)) ky nang mai hoi. hieu ((va cam) or (va cao)) quoc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang mai hoi. hieu ((va cam) OR (va cao)) quoc ban thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang mai hoi. hieu ((va cam) or (va cao)) quoc ban thanh di cua tre*.