Perhaps you should try some spelling variations:
kho tang » cao tang
hang hai » hoang hai, hang tai, thanh hai
ky tang » ky nang, ky dang, ky trong
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
luu van » cuu van, luan van, luu hanh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su can
ve cam » ve cham, ve cac, va cam

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

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