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

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