Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
qua ca » qua cac, qua cua, qua cai
xuc va » duc va, tuc va, luc va
ca xuc » cam xuc, chat xuc

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

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