Perhaps you should try some spelling variations:
quoc quan » qua quan, luc quan, hoc quan
cua tre » cuu tre, cua triet, dua tren
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac ban » cac dan, cac van, can ban
cua te » cua tu
anh va » hanh va
su sac » su sach, su cac, su xac
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang xa hoi. hieu ve cam ((quoc quan) or (cac ban)) anh va ((cua te) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. hieu ve cam ((quoc quan) OR (cac ban)) anh va ((cua te) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. hieu ve cam ((quoc quan) or (cac ban)) anh va ((cua te) or (cua tre))*.