Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
so sach » so sanh, bo sach, co sach
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cac luc » cau luc, coc luc, cac nuoc
tu cua » hu cua, vu cua
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((xang xa) or (lang xa)) hoi. hieu ve cac luc ((va thanh) OR (ban thanh)) tu cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((xang xa) OR (lang xa)) hoi. hieu ve cac luc ((va thanh) OR (ban thanh)) tu cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((xang xa) or (lang xa)) hoi. hieu ve cac luc ((va thanh) OR (ban thanh)) tu cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((xang xa) or (lang xa)) hoi. hieu ve cac luc ((va thanh) OR (ban thanh)) tu cua tu*.