Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham xuc » cam xuc, chat xuc, cham soc
ban hanh » ban hang
ky lang » ky dang, ky tang, tay lang
hieu va » hieu qua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ((ky lang) OR (ky nang)) xa hoi. ((hieu va) or (lieu va)) cham xuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu va) OR (lieu va)) cham xuc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu va) or (lieu va)) cham xuc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky lang) OR (ky nang)) xa hoi. ((hieu va) or (lieu va)) cham xuc ban hanh vi cua tre*.