Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
nang lai » nang tai, mang lai, nang cai
va thanh » gia thanh, ban thanh, va tinh
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
lai hoi » dai hoi, lai hoa, lai roi
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet

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 ly nang lai hoi. hieu va ((cac duc) or (cac du)) va thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang lai hoi. hieu va ((cac duc) OR (cac du)) va thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang lai hoi. hieu va ((cac duc) or (cac du)) va thanh dat cua tre*.