Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
nam xuc » cam xuc, nam xua, nam thuc
van anh » van thanh, tuan anh, van minh
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su cao, su 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 cac ((ky trong) or (kho tang)) xa hoi. hieu van nam xuc ((van anh) or (ban hang)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky trong) OR (kho tang)) xa hoi. hieu van nam xuc ((van anh) OR (ban hang)) hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: su cac ((ky trong) or (kho tang)) xa hoi. hieu van nam xuc ((van anh) or (ban hang)) hoi cua tre*.