Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cuc ban » cac ban, cuu ban, duc ban
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sac ky » cac ky, sai ky
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: thu sac ky dang xa hoi. hieu ve cam ((cuc ban) or (cua ban)) hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky dang xa hoi. hieu ve cam ((cuc ban) OR (cua ban)) hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sac ky dang xa hoi. hieu ve cam ((cuc ban) or (cua ban)) hanh vi ((cua tre) or (cuu tre))*.