Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
cham tuc » nham thuc, tham thuc, cham soc
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

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