Perhaps you should try some spelling variations:
cuu tre » cua tre, cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
cuc ban » cua ban, cac ban, cuu ban
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
vi cuu » vi luu, vinh cuu
te sac » te sach, te cac, te san

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang ((ma hoi) OR (mai hoi)). hieu ve chat ((cuc ban) OR (dua ban)) hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky sang ((ma hoi) OR (mai hoi)). hieu ve chat ((cuc ban) or (dua ban)) hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky sang ((ma hoi) OR (mai hoi)). hieu ve chat ((cuc ban) or (dua ban)) hanh vi cuu tre*.