Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
pham duy » pham duc
thu sach » tu sach, thuat sach, thuoc sach
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang ((ma hoi) OR (mai hoi)). hieu va ((phan tu) or (pham duy)) va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang ((ma hoi) OR (mai hoi)). hieu va ((phan tu) OR (pham duy)) va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang ((ma hoi) OR (mai hoi)). hieu va ((phan tu) or (pham duy)) va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang ((ma hoi) OR (mai hoi)). hieu va ((phan tu) or (pham duy)) va hanh dai cua triet*.