Perhaps you should try some spelling variations:
toc cach » toc sach, truoc cach, cuoc cach
hoc cach » hoc cac, hoc sach, cuoc cach
danh vai » danh sai, danh va, doanh van
cac suc » cao suc, cac nuoc, cac cuoc
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cao duc » dao duc, cao suc, giao duc
nano xa » nano va, nano bac, nano cau
tu nano » truc nano
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 cach) or (hoc cach)) tu nano xa hoi. hieu qua ((cac suc) or (cao duc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc cach) OR (hoc cach)) tu nano xa hoi. hieu qua ((cac suc) OR (cao duc)) va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc cach) or (hoc cach)) tu nano xa hoi. hieu qua ((cac suc) or (cao duc)) va danh vai cua tre*.