Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam truoc » lam thuoc, nam truoc, lam truong
hanh dai » hanh tai, hanh dao, vanh dai
nam truc » nam truoc, nam thuc, nam trung
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2

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 v ((nang ma) OR (tang ma)) hoi. hieu va ((lam truoc) or (nam truc)) va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang ma) OR (tang ma)) hoi. hieu va ((lam truoc) OR (nam truc)) va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang ma) OR (tang ma)) hoi. hieu va ((lam truoc) or (nam truc)) va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang ma) OR (tang ma)) hoi. hieu va ((lam truoc) or (nam truc)) va hanh dai cua triet*.