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
hoc sach » hoc sinh, hoc cac, hoc anh
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua

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 (hoc sach)) ky lang xa hoi. hieu ve ((cham tuc) OR (pham thuc)) va danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky lang xa hoi. hieu ve ((cham tuc) OR (pham thuc)) va danh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky lang xa hoi. hieu ve ((cham tuc) OR (pham thuc)) va danh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky lang xa hoi. hieu ve ((cham tuc) OR (pham thuc)) va danh vi cua triet*.