Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
cam thuc » am thuc, nam thuc, cam thu
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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: ((tu sach) or (((co sach) OR (hoc sach)))) ky nang xa hoi. hieu ve 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) OR (hoc sach)))) ky nang xa hoi. hieu ve 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) OR (hoc sach)))) ky nang xa hoi. hieu ve cam thuc va hanh dai cua triet*".