Perhaps you should try some spelling variations:
minh giao » trinh giao, tinh gia, dinh gia
canh giac » danh gia, anh giao, canh tac
cua tre » cua te, cuu tre, cua triet
cac lop » cac hop, cac loai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
san ky » sang ky, van ky, dan ky
cac lo » cac co, cac bo, cac ho
tu san » thu san, tu ban, 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: tu san ky nang xa hoi. hieu ve ((cac lo) or (cac lop)) van ((canh giac) or (minh giao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang xa hoi. hieu ve ((cac lo) OR (cac lop)) van ((canh giac) OR (minh giao)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang xa hoi. hieu ve ((cac lo) or (cac lop)) van ((canh giac) or (minh giao)) cua tre*.