Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
sach dao » lanh dao
va triet » va thiet, va trien, ve triet
dao lang » dao khang, dao quang, dao trang
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
va lanh » va lang, va danh, va anh
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
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 dao lang xa hoi. hieu ve ((tham thuc) or (pham thuc)) ((va lanh) OR (va hanh)) dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dao lang xa hoi. hieu ve ((tham thuc) OR (pham thuc)) ((va lanh) OR (va hanh)) dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach dao lang xa hoi. hieu ve ((tham thuc) or (pham thuc)) ((va lanh) OR (va hanh)) dao va triet".
• Adding a wildcard symbol may retrieve word variants: su sach dao lang xa hoi. hieu ve ((tham thuc) or (pham thuc)) ((va lanh) OR (va hanh)) dao va triet*.