Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh tu » hanh tu, nhanh tu, thanh tung
co sach » bo sach, cuon sach, hoc 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
cua tu » cua tuc, cua cu, cua te
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
cua su » qua su

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

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