Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
cham xuc » cam xuc, chat xuc, cham soc
hoc sach » hoc sinh, hoc cac, hoc anh
thi hang » thi hanh, thi nang, thi hong
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
cua tre » cua te, cuu tre, cua triet
anh vi » anh va, anh ve, anh vu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) OR (hoc sach)) thi hang xa hoi. hieu va cham xuc van ((anh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) thi hang xa hoi. hieu va cham xuc van ((anh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (hoc sach)) thi hang xa hoi. hieu va cham xuc van ((anh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (hoc sach)) thi hang xa hoi. hieu va cham xuc van ((anh vi) or (hanh vi)) cua tre*.