Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lai » thanh hai, thanh lap, thanh loi
cach hoc » cach thuc, cach thoi, dich hoc
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
nang ma » tang ma, sang ma, mang may
cac hoc » cac hop, bac hoc, cac toc
lai cua » dai cua, hai cua, lai chau

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 y ((nang ma) OR (nang cao)) hoi. lieu va ((cac hoc) or (cach hoc)) va thanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (nang cao)) hoi. lieu va ((cac hoc) OR (cach hoc)) va thanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang ma) OR (nang cao)) hoi. lieu va ((cac hoc) or (cach hoc)) va thanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) OR (nang cao)) hoi. lieu va ((cac hoc) or (cach hoc)) va thanh lai cua triet*.