Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
te sach » toc sach
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
dai su » dai sua, dai so, dan su
ve am » va am

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 y nang co hoc. hieu ve am thuc ((va hanh) OR (va thanh)) dai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang co hoc. hieu ve am thuc ((va hanh) OR (va thanh)) dai su triet".
• Adding a wildcard symbol may retrieve word variants: te sach y nang co hoc. hieu ve am thuc ((va hanh) OR (va thanh)) dai su triet*.