Perhaps you should try some spelling variations:
cuu tre » cau tren, cau treo
va dung » van dung, va duong, vat dung
cua tre » cua te, cua triet, dua tren
dung co » dung cho, dung cong, dung cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
nam tu » nam thu, nam thuc
sac ky » cac ky
ve nam » he nam, va nam, le nam

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: so ((sac ky) OR (sai ky)) nang xa hoi. hieu ve nam tu va dung co ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sac ky) OR (sai ky)) nang xa hoi. hieu ve nam tu va dung co ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: so ((sac ky) OR (sai ky)) nang xa hoi. hieu ve nam tu va dung co ((cua tre) or (cuu tre))*.