Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh lai » tinh lao, tinh hai, minh lai
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
dan may » dam may, dan tay, dat may
van cac » van hac, van cau, van bac
so sach » bo sach, co sach, hoc sach
nang xa » nang x, lang xa, mang xa
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao

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