Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cam cua » ca cua, nam cua, cau cua
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
cua te » cua tu

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 y)) dang xa hoi. hieu va cam cua ban hanh vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach y)) dang xa hoi. hieu va cam cua ban hanh vai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach y)) dang xa hoi. hieu va cam cua ban hanh vai ((cua tre) OR (cua te))*".