Perhaps you should try some spelling variations:
hoang dai » hoang hai, hoang mai, hoang da
van hoang » van hoan, quan hoang, tran hoang
va triet » va thiet, va trien, ve triet
cam thuc » am thuc, nam thuc, can thuc
cam thu » nam thu, cac thu, ca thu
so sach » bo sach, co sach, hoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
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: ((so sach) OR (so sanh)) ky nang xa hoi. hieu va ((cam thuc) or (cam thu)) van hoang dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky nang xa hoi. hieu va ((cam thuc) OR (cam thu)) van hoang dai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ky nang xa hoi. hieu va ((cam thuc) or (cam thu)) van hoang dai va triet*".