Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
ve cac » va cac, vien cac
du cua » duy cua, dau cua, dum cua
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 tu ((xang xa) or (lang xa)) hoi. hieu ve cac nuoc ((va thanh) OR (gia thanh)) du cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((xang xa) OR (lang xa)) hoi. hieu ve cac nuoc ((va thanh) OR (gia thanh)) du cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((xang xa) or (lang xa)) hoi. hieu ve cac nuoc ((va thanh) OR (gia thanh)) du cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((xang xa) or (lang xa)) hoi. hieu ve cac nuoc ((va thanh) OR (gia thanh)) du cua tu*.