Perhaps you should try some spelling variations:
van hoang » van hoan, quan hoang, tran hoang
cuon sach » duong sach, cuoc cach, co sach
hoang dai » hoang hai, hoang mai, hoang da
cac thuc » cach thuc, can thuc, cay thuc
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cac thu » cach thuc, cac thoi
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: cuon sach ky ((nang xa) OR (nang x)) hoi. hieu va ((cac thuc) or (cac thu)) van hoang dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cuon sach ky ((nang xa) OR (nang x)) hoi. hieu va ((cac thuc) OR (cac thu)) van hoang dai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cuon sach ky ((nang xa) OR (nang x)) hoi. hieu va ((cac thuc) or (cac thu)) van hoang dai va triet*".