Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cac thuc » cac thu, can thuc, cay thuc
chu viet » che viet, khau viet, su viet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
hanh va » hang va

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 xang xa hoi. hieu ve ((cac thuc) OR (cach thuc)) va ((hanh va) or (hanh vi)) chu viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu ve ((cac thuc) OR (cach thuc)) va ((hanh va) OR (hanh vi)) chu viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang xa hoi. hieu ve ((cac thuc) OR (cach thuc)) va ((hanh va) or (hanh vi)) chu viet*".