Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
quoc ban » quoc bao, quoc lan, quoc quan
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
va cao » va cac, va co, va dao
sac ky » cac ky, sai ky
ve cao » ve bao, ve cac, ve co

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 cao) OR (va 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 cao) OR (va 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 cao) OR (va cao)) quoc ban hanh vai cuu tre*".