Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
cam thuc » am thuc, nam thuc, cam thu
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
co sach » bo sach, cuon sach, hoc sach
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu va cam thuc va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu va cam thuc va hanh dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu va cam thuc va hanh dai cua triet*".