Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
minh lai » minh hai, minh ai, minh lam
tinh lai » tinh lao, tinh hai, tinh bai
hieu van » hieu va, thien van, lieu va
cac day » cac dan, cac dai, cac cay
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang x) or (nang ma)) hoi. hieu van cac day va ((tinh lai) OR (minh lai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang x) OR (nang ma)) hoi. hieu van cac day va ((tinh lai) OR (minh lai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang x) or (nang ma)) hoi. hieu van cac day va ((tinh lai) OR (minh lai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang x) or (nang ma)) hoi. hieu van cac day va ((tinh lai) OR (minh lai)) cua triet*.