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
hanh lam » thanh lap, hanh kem, dinh lam
toc sach » hoc sach, doc sach, thuoc sach
thi hanh » thi thanh
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
va hoi » xa hoi, va hoc, va hoa
lam va » nam va, dam va, lam ha

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 (toc sach)) thi hanh va hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) thi hanh va hoi. hieu ve ((cham tuc) OR (pham thuc)) va hanh lam va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) thi hanh va hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh lam va triet*.