Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac cuu » cap cuu, cac cau, cac chu
cuu ban » cuu van, cua ban, cuu san
hai cua » thai cua, hoi cua, lai cua
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sac ky)) nang xa hoi. hieu ve cac cuu ban thanh ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu ve cac cuu ban thanh ((hai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu ve cac cuu ban thanh ((hai cua) or (dai cua)) tre*.