Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cam cac » ca cac, nam cac, cam chan
cac ban » cac dan, cac van, can ban
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
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 ty)) dang xa hoi. hieu ve cam cac ban hanh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach ty)) dang xa hoi. hieu ve cam cac ban hanh tai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach ty)) dang xa hoi. hieu ve cam cac ban hanh tai ((cua tre) OR (cua te))*".