Perhaps you should try some spelling variations:
hang thai » hoang thai, hang tai, hong thai
hang hai » hoang hai, hang tai, thanh hai
cua tre » cua te, cuu tre, cua triet
cao xuc » cam xuc, cao duc, cao suc
qua cao » qua cac, qua ca, qua cai
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
ha hoi » ha noi, xa hoi, va hoi
tu sac » tu sach, tu cac, tu san

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang ((ha hoi) OR (hoa hoi)). hieu qua cao xuc va ((hang thai) OR (hang hai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang ((ha hoi) OR (hoa hoi)). hieu qua cao xuc va ((hang thai) or (hang hai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ((ha hoi) OR (hoa hoi)). hieu qua cao xuc va ((hang thai) or (hang hai)) cua tre*.