Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
nang hoa » nang hoat, hang hoa, nang hoc
nam thuc » nam thuoc, am thuc, nam thu
va danh » va dinh, va dan, dia danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
hoa hoi » khoa hoi, hoa hoc, hoa doi
va hanh » van hanh, va thanh, ban hanh
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang hoa hoi. hieu he nam thuc ((va hanh) or (va danh)) hai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang hoa hoi. hieu he nam thuc ((va hanh) OR (va danh)) hai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang hoa hoi. hieu he nam thuc ((va hanh) or (va danh)) hai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang hoa hoi. hieu he nam thuc ((va hanh) or (va danh)) hai ((cua triet) OR (va triet))*.