Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
kho tang » cao tang
van hang » van khang, van hoang, van thang
hang hai » hoang hai, hang tai, thanh hai
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su can » su van, su cao, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su can ((ky trong) or (kho tang)) xa hoi. hieu qua cac luc van hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can ((ky trong) OR (kho tang)) xa hoi. hieu qua cac luc van hang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su can ((ky trong) or (kho tang)) xa hoi. hieu qua cac luc van hang hai cua tre*.