Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
nham thu » nam thu, pham thu, nhan thuc
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu dang » thu dang, tu dong, su dang
dang ma » dang mau, dang mam, dang mat
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh ki » hanh vi, hanh ky, hanh kien
ma hoi » mai hoi, xa hoi, ma hoa
ki su » ky su

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 tu dang ma hoi. hieu va ((nham thuc) OR (nham thu)) va hanh ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu dang ma hoi. hieu va ((nham thuc) OR (nham thu)) va hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach tu dang ma hoi. hieu va ((nham thuc) OR (nham thu)) va hanh ki su triet*.