Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
hanh vai » hanh vi, hanh va, hanh tai
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
co sach » bo sach, cuon sach, hoc sach
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
ve cam » ve cham, ve cac, va cam

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) or (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc va hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc va hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc va hanh vai cua triet*".