Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
cac duc » cac du, cac dac, cac nuoc
dai cuu » dai cua, dai huu
va vanh » va van, va danh, va hanh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
xang x » nang x
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: ((te sach) or (hoc sach)) ty xang x hoi. hieu va ((cac duc) OR (cao duc)) va vanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ty xang x hoi. hieu va ((cac duc) OR (cao duc)) va vanh dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ty xang x hoi. hieu va ((cac duc) OR (cao duc)) va vanh dai cuu tre*".