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