Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
chat xuc » chat huu, cam xuc, chao xu
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dap
va dau » va dao
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: ((hoc sach) or (hoc sinh)) ky nang x hoi. hieu va chat xuc ((va dan) OR (va dau)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky nang x hoi. hieu va chat xuc ((va dan) OR (va dau)) sai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (hoc sinh)) ky nang x hoi. hieu va chat xuc ((va dan) OR (va dau)) sai cua tre*".