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

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) OR (tu 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) OR (tu can)) ((ky trong) OR (kho tang)) xa hoi. hieu qua cac luc van hang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su can) OR (tu 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) OR (tu can)) ((ky trong) or (kho tang)) xa hoi. hieu qua cac luc van hang hai cua tre*.