Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cham xuc » cam xuc, chat xuc, cham soc
sach thi » sach thu, sach tai, sach thieu
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa
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 thi ((hang xa) OR (hang ca)) 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 thi ((hang xa) OR (hang ca)) 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 thi ((hang xa) OR (hang ca)) hoi. hieu va cham xuc van ((anh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach thi ((hang xa) OR (hang ca)) hoi. hieu va cham xuc van ((anh vi) or (hanh vi)) cua tre*.