Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
va triet » va thiet, va trien, ve triet
cham tuc » nham thuc, tham thuc, cham soc
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
hieu ve » hieu va, hieu van
dao va » dao van, tao va, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) or (ky dang)) van hoi. hieu ve ((cham tuc) OR (pham thuc)) va van dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (ky dang)) van hoi. hieu ve ((cham tuc) OR (pham thuc)) va van dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) or (ky dang)) van hoi. hieu ve ((cham tuc) OR (pham thuc)) va van dao va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (ky dang)) van hoi. hieu ve ((cham tuc) OR (pham thuc)) va van dao va triet*.