Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh tai, hanh van
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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: hoc sach ty nang xa hoi. lieu va ((cam duc) OR (cao duc)) van ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty nang xa hoi. lieu va ((cam duc) OR (cao duc)) van ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty nang xa hoi. lieu va ((cam duc) OR (cao duc)) van ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang xa hoi. lieu va ((cam duc) OR (cao duc)) van ((hanh vai) or (hanh va)) cua tre*.