Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
thuc van » thuc vat, thuc dan, thuc va
danh sai » dung sai, danh bat, danh dau
van danh » van doanh, van anh, van hanh
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
su sach » so sach, vu sach
co hoi » co hoc, co loi
va am » va lam, 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 (su sach)) ky nang co hoi. hieu va am thuc van danh sai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang co hoi. hieu va am thuc van danh sai ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang co hoi. hieu va am thuc van danh sai ((cua triet) or (va triet))*".