Perhaps you should try some spelling variations:
cao quoc » cac quoc, cao thuoc, han quoc
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
vai cuu » vai cua
sach ty » sach y, sach tu, sach thu
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
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) or (sach ty)) dang xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach ty)) dang xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban hanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach ty)) dang xa hoi. ((hieu ve) OR (hieu van)) cao quoc ban hanh vai cuu tre*".